Thursday, June 8, 2023

Mounting research documents the harmful effects of social media use on mental health, including body image and development of eating disorders

The hours spent – and the content viewed – by teens on social media can lead to depression, anxiety and body image issues. Mixmike/E+via Getty Images
Emily Hemendinger, University of Colorado Anschutz Medical Campus

Media influences and conventional beauty standards have long plagued society.

This issue took on new urgency in May 2023 when the U.S. surgeon general issued a major public advisory over the links between social media and youth mental health.

Research shows that images of beauty as depicted in movies, television and magazines can lead to mental illness, issues with disordered eating and body image dissatisfaction.

These trends have been documented in women and men, in the LGBTQ+ community and in people of different racial and ethnic backgrounds.

Experts have long suspected that social media may be playing a role in the growing mental health crisis in young people. However, the surgeon general’s warning is one of the first public warnings supported by robust research.

The U.S. surgeon general says the youth mental health crisis is the ‘defining public health challenge of our time.’

Social media can be toxic

Body dissatisfaction among children and adolescents is commonplace and has been linked to decreased quality of life, worsened mood and unhealthy eating habits.

As an eating disorder and anxiety specialist, I regularly work with clients who experience eating disorder symptoms, self-esteem issues and anxiety related to social media.

I also have firsthand experience with this topic: I am 15 years post-recovery from an eating disorder, and I grew up when people were beginning to widely use social media. In my view, the impact of social media on diet and exercise patterns needs to be further researched to inform future policy directions, school programming and therapeutic treatment.

The mental health of adolescents and teens has been declining for the past decade, and the COVID-19 pandemic contributed to worsening youth mental health and brought it into the spotlight. As the mental health crisis surges, researchers have been taking a close look at the role of social media in these increasing mental health concerns.

The pros and cons of social media

About 95% of children and adolescents in the U.S. between the ages of 10 and 17 are using social media almost constantly.

Research has shown that social media can be beneficial for finding community support. However, studies have also shown that the use of social media contributes to social comparisons, unrealistic expectations and negative mental health effects.

In addition, those who have preexisting mental health conditions tend to spend more time on social media. People in that category are more likely to self-objectify and internalize the thin body ideal. Women and people with preexisting body image concerns are more likely to feel worse about their bodies and themselves after they spend time on social media.

A breeding ground for eating disorders

A recent review found that, as with mass media, the use of social media is a risk factor for the development of an eating disorder, body image dissatisfaction and disordered eating. In this review, social media use was shown to contribute to negative self-esteem, social comparisons, decreased emotional regulation and idealized self-presentation that negatively influenced body image.

Another study, called the Dove Self-Esteem Project, published in April 2023, found that 9 in 10 children and adolescents ages 10 to 17 are exposed to toxic beauty content on social media and 1 in 2 say that this has an impact on their mental health.

Eating disorders are complex mental illnesses that develop because of biological, social and psychological factors. Eating disorder hospitalizations and the need for treatment have dramatically increased during the pandemic.

Some reasons for this include isolation, food scarcity, boredom and social media content related to weight gain, such as the “quarantine15.” That was a reference to the weight gain some people were experiencing at the beginning of the pandemic, similar to the “freshman 15” belief that one will gain 15 pounds in the first year of college. Many teens whose routines were disrupted by the pandemic turned to eating disorder behaviors for an often-false sense of control or were influenced by family members who held unhealthy beliefs around food and exercise.

Researchers have also found that increased time at home during the pandemic led to more social media use by young people and therefore more exposure to toxic body image and dieting social media content.

While social media alone will not cause eating disorders, societal beliefs about beauty, which are amplified by social media, can contribute to the development of eating disorders.

According to a report from the Centers for Disease Control and Prevention, 42% of high school students say they feel ‘persistently sad’ and ‘hopeless.’

‘Thinspo’ and ‘fitspo’

Toxic beauty standards online include the normalization of cosmetic and surgical procedures and pro-eating-disorder content, which promotes and romanticizes eating disorders. For instance, social media sites have promoted trends such as “thinspo,” which is focused on the thin ideal, and “fitspo,” which perpetuates the belief of there being a perfect body that can be achieved with dieting, supplements and excessive exercise.

Research has shown that social media content encouraging “clean eating” or dieting through pseudoscientific claims can lead to obsessive behavior around dietary patterns. These unfounded “wellness” posts can lead to weight cycling, yo-yo dieting, chronic stress, body dissatisfaction and higher likelihood of muscular and thin-ideal internalization.

Some social media posts feature pro-eating-disorder content, which directly or indirectly encourages disordered eating. Other posts promote deliberate manipulation of one’s body, using harmful quotes such as “nothing tastes as good as thin feels.” These posts provide a false sense of connection, allowing users to bond over a shared goal of losing weight, altering one’s appearance and continuing patterns of disordered eating.

While young people can often recognize and understand toxic beauty advice’s effects on their self-esteem, they may still continue to engage with this content. This is in part because friends, influencers and social media algorithms encourage people to follow certain accounts.

Not all teens are on social media.

How policy changes could help

Legislators across the U.S. are proposing different regulations for social media sites.

Policy recommendations include increased transparency from social media companies, creation of higher standards of privacy for children’s data and possible tax incentives and social responsibility initiatives that would discourage companies and marketers from using altered photos.

Phone-free zones

Small steps at home to cut down on social media consumption can also make a difference. Parents and caregivers can create phone-free periods for the family. Examples of this include putting phones away while the family watches a movie together or during mealtimes.

Adults can also help by modeling healthy social media behaviors and encouraging children and adolescents to focus on building connections and engaging in valued activities.

Mindful social media consumption is another helpful approach. This requires recognizing what one is feeling during social media scrolling. If spending time on social media makes you feel worse about yourself or seems to be causing mood changes in your child, it may be time to change how you or your child interact with social media.

Emily Hemendinger, Assistant Professor of Psychiatry, University of Colorado Anschutz Medical Campus

This article is republished from The Conversation under a Creative Commons license. 

Reconsider That Fixer Upper: Financing option makes home improvement more attainable

For younger homeowners and first-time homebuyers in particular, money is likely to be tight. When most available cash is directed to the best possible down payment to secure a home in a desired neighborhood, there's often little left for improvements.

According to a Profile of Buyers' Home Feature Preference Report from the National Association of Realtors, 53% of homebuyers took on a home improvement project within three months of buying with kitchen projects being a priority for 47% of those surveyed. However, when buyers finance a home renovation into their mortgage application, they can broaden their options of available properties to include fixer-uppers that can be upgraded prior to move-in.

A finance option like the Guaranteed Rate Home Renovation Loan allows homebuyers to visualize the home they want versus the one that’s listed. By rolling renovation costs into their mortgage, buyers can enjoy a home tailored to their vision while paying a little extra each month for upgraded windows, siding, decks, kitchens, bathrooms or a walk-in closet. In many cases, the project can be completed after closing but prior to moving in with contractor commitments to stay within budget.

If cosmetic or structural improvements are needed when prospective homeowners find a property worth bidding on, they can work with a licensed loan officer to secure a home renovation loan. The borrower’s choice of contractor that meets the lender criteria submits an estimate that’s reviewed and validated by the lender. Once approved and the mortgage is closed, the renovation can begin with costs paid upfront, added to the loan and repaid as part of the mortgage.

 

 

Consider renovation projects like these:

Luxury Renovations are geared toward the enjoyment of a home. They might be as easy as updating an entertainment room or reworking existing landscaping or as complex as adding a swimming pool, hot tub, outdoor kitchen or fitness area.

Structural Renovations affect load-bearing elements like posts, beams or even the foundation or walls of the home. Some examples include adding a garage, raising a roof, converting rooms or adding square footage to the house.

Non-Structural Renovations do not affect load-bearing elements and are often more cosmetic, including remodeling kitchens or bathrooms, repainting, replacing siding and upgrading for accessibility.

Consider the out-of-pocket costs of similar non-structural renovation projects according to Remodeling Magazine’s 2023 Cost vs. Value Report when compared with the monthly price of financing via a Guaranteed Rate Home Renovation Loan based a sample mortgage payment of $2,525/month*.

  • Bathroom remodel: $24,606 out of pocket versus $127 per month financed
  • Hardwood flooring: $4,900 out of pocket versus $25 per month financed
  • Finished basement: $18,400 out of pocket versus $95 per month financed
  • Kitchen remodel: $77,939 out of pocket versus $402 per month financed
  • Solar panels: $20,000 out of pocket versus $103 per month financed

Find more solutions to make the home renovation process easier at Rate.com.

*Example portions of payments allocated to renovation costs are based on a purchase price of $388,800, down payment of 20%, 30-year [fixed] rate mortgage at a rate of 6.69%/7.364% annual percentage rate (APR) and 360 mortgage payments of $2,525. FICO score and lock days based on 740 FICO and 45-day lock. Advertised rates and APR effective as of 05/25/23 and are subject to change without notice.

SOURCE:
Guaranteed Rate

Save Time with Sweet, Savory, Salty Snacks

Work, social commitments, kids’ activities and the daily grind can take over schedules and wreak havoc on your opportunities to sit at the table for meals. As your calendar seems to fill up with meetings, family occasions and more, you might just find yourself skipping breakfast or lunch and opting for filling snacks instead.

In fact, according to the International Food Information Council’s 2022 Food and Health Survey, 75% of Americans snack at least once per day, which means 2023 could become the year of the snack. Whether it’s forgoing breakfast at home for a bite on the go or powering up with an afternoon morsel, one flavor favorite and nutritional powerhouse you can turn to is the pecan.

As pecans are used in an increasing number of snack innovations, they’re being hailed as the fastest growing nut in new snack applications, according to Information Resources Inc. They’re an ideal snack for punching up your routine with great taste, plant-based nutrition and an easy-to-pair profile.

For example, they’re poised to remix your snack mix mentality as they complement sweet, savory, spicy and buttery combinations. Ready in less than half an hour, you can add some sweetness to your workday with this Pecan Snack Mix with Cranberries and Chocolate for a fruity, nutty, chocolatey twist on traditional trail mix.

If a saltier treat is more your speed, consider this Salty Pecan Snack Mix for a grab-and-go breakfast as you head out the door or an easy way to keep hunger at bay in the afternoon. Because pecans pair with a variety of ingredients and flavors, they’re a perfect partner for this combination of rolled oats, coconut, honey, cinnamon and more.

Find more sweet and savory recipe inspiration at EatPecans.com.

Pecan Snack Mix with Cranberries and Chocolate

Recipe courtesy of Jess Larson and the American Pecan Promotion Board
Prep time: 10 minutes
Cook time: 5 minutes, plus 10 minutes cooling time

  • 1 cup pecan halves
  • 1 cup rice squares cereal (wheat or cinnamon)
  • 1/2 cup pretzels
  • 2 tablespoons unsalted butter
  • 1 tablespoon brown sugar
  • 1 1/2 tablespoons pure maple syrup
  • 1/2 teaspoon kosher salt
  • 1/4 teaspoon ground nutmeg
  • 1/2 cup dried cranberries
  • 1/2 cup dark chocolate chips
  1. In large, microwave-safe bowl, add pecans, rice squares cereal and pretzels. In small, microwave-safe bowl, add butter, brown sugar, maple syrup, salt and nutmeg. Microwave butter mixture 1-2 minutes until melted then pour over dry mix. Toss well to combine.
  2. Microwave snack mix in 45-second intervals, about 4-5 intervals total, until mix is fragrant, golden and toasty.
  3. Cool mix completely then stir in cranberries and dark chocolate chips.

Salty Pecan Snack Mix

Recipe courtesy of Mallory Oniki and the American Pecan Promotion Board
Prep time: 10 minutes
Cook time: 20 minutes
Servings: 15

  • 2 cups rice squares cereal
  • 1 cup rolled oats
  • 1 cup unsweetened coconut
  • 1/3 cup honey
  • 1/4 cup coconut oil
  • 1/2 teaspoon cinnamon
  • 1/2 teaspoon salt
  • 1/4 cup butter
  • 2 cups chopped pecans
  • 1 cup oyster crackers
  1. Preheat oven to 350 F.
  2. In bowl, add rice squares cereal, oats and unsweetened coconut.
  3. In small saucepan over medium heat, add honey, coconut oil, cinnamon and salt. Stir until mixture starts to boil then pour over snack mix and stir until well combined.
  4. Transfer to baking sheet and bake 8-10 minutes.
  5. In saucepan over medium heat, add butter. Stir until butter browns then add chopped pecans and oyster crackers. Turn heat to low and stir while pecans roast.
  6. Remove snack mix from oven and add brown butter pecan and cracker mixture; stir to combine.
SOURCE:
American Pecan Promotion Board
 

Blockchain is a key technology – a computer scientist explains why the post-crypto-crash future is bright

Blockchain technology has many uses beyond cryptocurrency. Yuichiro Chino/Moment via Getty Images
Yu Chen, Binghamton University, State University of New York

People hear a lot about blockchain technology in relation to cryptocurrencies like bitcoin, which rely on blockchain systems to keep records of financial transactions between people and businesses. But a crash in public trust in cryptocurrencies like TerraUSD – and therefore a massive drop in their market value – doesn’t mean their underlying technology is also worthless.

In fact, there are plenty of other uses for this type of system, which does not rely on centralized storage and where many people can participate securely, even if they don’t all know each other.

As a computer scientist exploring new technologies for future smart communication network technologies, I, along with many engineers and developers, have shown that blockchain technology is a promising solution to many challenging problems in trust and security of next-generation network-based applications. I see several ways blockchains are proving themselves useful that aren’t tied to cryptocurrency.

Supply chains

Modern global supply chains require a huge amount of information for the massive number of products being shipped around the world. They suffer from limits on data storage capacity, inefficient paper processes, disjointed data systems and incompatible data formats. These traditional centralized data storage methods cannot efficiently trace the origin of problems, like where a poor-quality product came from.

Storing information on a blockchain improves integrity, accountability and traceability. For example, IBM’s Food Trust uses a blockchain system to track food items from the field to retailers. The participants in the food supply chain record transactions in the shared blockchain, which simplifies keeping track.

Health care

Data ownership and privacy are top concerns in the health care industry. Current centralized systems cannot meet all the diverse needs of patients, health service providers, insurance companies and governmental agencies. Blockchain technology enables a decentralized system for access control of medical records where all stakeholders’ interests are protected.

Blockchain systems not only allow health care service providers to securely share patients’ medical records but also enable patients to track who has accessed their records and determine who is authorized to do so.

A cargo ship is alongside a pier with ranks of hundreds of shipping containers stacked nearby.
Blockchain systems are already helping companies track items through complex global supply chains. AP Photo/Michael Probst

Banking and finance

Banking and finance benefit from integrating blockchain networks into their business operations. Instead of trying to develop cryptocurrencies with new or different capabilities, the financial sector has recognized that blockchain systems are a reliable way to store information about traditional currencies like the dollar, euro and yen, as well as financial products.

Blockchains provide consumers with the convenience of being able to monitor their transactions as they are processed, almost in real time from anywhere. Banks also benefit from blockchains, with the opportunity to conduct business between institutions more efficiently and securely.

Property records

Today’s manual process of recording property rights is burdensome and inefficient. Traditional paper documentation is time-consuming, labor intensive, not transparent and vulnerable to loss. Blockchain technology eliminates inconvenience, inefficiency and errors, and reduces the cost by migrating the entire process into a digital form.

Blockchain systems allow owners to trust that their deed is accurate and permanently recorded. Remote access is particularly meaningful to people living in areas without sufficient governmental or financial infrastructure.

Voting

Validating votes and maintaining voter privacy seem like conflicting requirements. Blockchain systems hold promise as a means to facilitate a fair and transparent modern voting system. Because it’s almost impossible to tamper with a blockchain-enabled voting system, it can maintain a transparent electoral process.

In the November 2018 midterm elections in West Virginia, a blockchain-based voting system was used and found to be secure and reliable.

Smart cities

A smart city embeds information and communication technologies into its facilities, infrastructure and services to provide its residents a convenient, intelligent and comfortable living space. A smart city is essentially a network of many devices that can communicate with each other to share data. Connected devices can include people’s smartphones, vehicles, electrical meters, public safety monitoring systems and even homes.

These systems have performance, security and privacy requirements that centralized information systems cannot handle. Blockchain is a key networking technology for building smart cities because it’s able to optimize operations, enhance security guarantees and increase mutual trust among participants.

The future of information technology is all about decentralization. Today’s centralized architecture fails to meet the increasingly diverse needs of people who want freedom to personalize their own services, control their digital assets and more easily participate in democratic processes. Blockchain is a key enabling technology for building any secure and durable decentralized information system.

Yu Chen, Professor of Electrical and Computer Engineering, Binghamton University, State University of New York

This article is republished from The Conversation under a Creative Commons license.

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Monday, June 5, 2023

Farmers face a soaring risk of flash droughts in every major food-growing region in coming decades, new research shows

A flash drought in 2012 dried out soil, harming crops in Kansas and several other states. John Moore/Getty Images
Jeff Basara, University of Oklahoma and Jordan Christian, University of Oklahoma

Flash droughts develop fast, and when they hit at the wrong time, they can devastate a region’s agriculture.

They’re also becoming increasingly common as the planet warms.

In a new study published May 25, 2023, we found that the risk of flash droughts, which can develop in the span of a few weeks, is on pace to rise in every major agriculture region around the world in the coming decades.

In North America and Europe, cropland that had a 32% annual chance of a flash drought a few years ago could have as much as a 53% annual chance of a flash drought by the final decades of this century. The result would put food production, energy and water supplies under increasing pressure. The cost of damage will also rise. A flash drought in the Dakotas and Montana in 2017 caused US$2.6 billion in agricultural damage in the U.S. alone.

A dry field of short, sad looking corn stalks with a farm with cattle in the background.
Stunted corn in Nebraska struggles to grow during the 2012 flash drought that covered much of the central U.S. AP Photo/Nati Harnik

How flash droughts develop

All droughts begin when precipitation stops. What’s interesting about flash droughts is how fast they reinforce themselves, with some help from the warming climate.

When the weather is hot and dry, soil loses moisture rapidly. Dry air extracts moisture from the land, and rising temperatures can increase this “evaporative demand.” The lack of rain during a flash drought can further contribute to the feedback processes.

Under these conditions, crops and vegetation begin to die much more quickly than they do during typical long-term droughts.

Global warming and flash droughts

In our new study, we used climate models and data from the past 170 years to gauge the drought risks ahead under three scenarios for how quickly the world takes action to slow global warming.

If greenhouse gas emissions from vehicles, power plants and other human sources continue at a high rate, we found that cropland in much of North America and Europe would have a 49% and 53% annual chance of flash droughts, respectively, by the final decades of this century. Globally, the largest projected increases would be in Europe and the Amazon.

Slowing emissions can reduce the risk significantly, but we found flash droughts would still increase by about 6% worldwide under a low-emissions scenario.

Charts show the amount of cropland experiencing flash droughts today in Africa, Asia, Australia, North America, South America and Europe, and project how flash drought exposure will increase based on greenhouse gas emissions that drive global warming.
Climate models indicate that more land will be in flash drought in every region in the coming decades. Three scenarios show how low (SSP126), medium (SSP245) and high (SSP585) emissions are likely to affect the amount of land in flash drought. In some regions, rising global emissions will bring more extreme rainfall, offsetting drought. Jordan Christian

Timing is everything for agriculture

We’ve lived through a number of flash drought events, and they’re not pleasant. People suffer. Farmers lose crops. Ranchers may have to sell off cattle. In 2022, a flash drought slowed barge traffic on the Mississippi River, which carries more than 90% of U.S. agriculture exports.

If a flash drought occurs at a critical point in the growing season, it could devastate an entire crop.

Corn, for example, is most vulnerable during its flowering phase, called silking. That typically happens in the heat of summer. If a flash drought occurs then, it’s likely to have extreme consequences. However, a flash drought closer to harvest can actually help farmers, as they can get their equipment into the fields more easily.

A line of houseboats that once floated on a river sit in puddles on the nearly dry riverbed during a flash drought.
During Europe’s flash drought in 2022, floating houses were left sitting on a dry riverbed in the Netherlands. Thierry Monasse/Getty Images

In the southern Great Plains, winter wheat is at its highest risk during seeding, in September to October the year before the crop’s spring harvest. When we looked at flash droughts in that region during that fall seeding period, we found greatly reduced yields the following year.

Looking globally, paddy rice, a staple for more than half the global population, is at risk in northeast China and other parts of Asia. Other crops are at risk in Europe.

Ranches can also be hit hard by flash droughts. During the huge flash drought in 2012 in the central U.S., cattle ran out of forage and water became scarcer. If rain doesn’t fall during the growing season for natural grasses, cattle don’t have food, and ranchers may have little choice but to sell off part of their herds. Again, timing is everything.

It’s not just agriculture. Energy and water supplies can be at risk, too. Europe’s intense summer drought in 2022 started as a flash drought that became a larger event as a heat wave settled in. Water levels fell so low in some rivers that power plants shut down because they couldn’t get water for cooling, compounding the region’s problems. Events like those are a window into what countries are already facing and could see more of in the future.

Not every flash drought will be as severe as what the U.S. and Europe saw in 2012 and 2022, but we’re concerned about what may be ahead.

A flash drought developed in the span of a few weeks in 2019. NASA Earth Observatory

Can agriculture adapt?

One way to help agriculture adapt to the rising risk is to improve forecasts for rainfall and temperature, which can help farmers as they make crucial decisions, such as whether they’ll plant or not.

When we talk with farmers and ranchers, they want to know what the weather will look like over the next one to six months. Meteorology is pretty adept at short-term forecasts that look out a couple of weeks, and at longer-term climate forecasts using computer models. But flash droughts evolve in a midrange window of time that is difficult to forecast.

We’re tackling the challenge of monitoring and improving the lead time and accuracy of forecasts for flash droughts, as are other scientists. For example, the United States Drought Monitor has developed an experimental short-term map that can display developing flash droughts. As scientists learn more about the conditions that cause flash droughts and about their frequency and intensity, forecasts and monitoring tools will improve.

Increasing awareness can also help. If short-term forecasts show that an area is not likely to get its usual precipitation, that should immediately set off alarm bells. If forecasters are also seeing the potential for increased temperatures, that heightens the risk for a flash drought’s developing.

Nothing is getting easier for farmers and ranchers as global temperatures rise. Understanding the risk from flash droughts will help them, and anyone concerned with water resources, manage yet another challenge of the future.

Jeff Basara, Associate Professor of Meteorology, University of Oklahoma and Jordan Christian, Postdoctoral Researcher in Meteorology, University of Oklahoma

This article is republished from The Conversation under a Creative Commons license.

Sunday, June 4, 2023

To have better disagreements, change your words – here are 4 ways to make your counterpart feel heard and keep the conversation going

Showing you’re listening is a critical part of fraught discussions. Thomas Barwick/DigitalVision via Getty Images
Julia Minson, Harvard Kennedy School

Your 18-year-old daughter announces she’s in love, dropping out of college and moving to Argentina. Your yoga-teaching brother refuses to get vaccinated for COVID-19 and is confident that fresh air is the best medicine. Your boss is hiring another white man for a leadership team already made up entirely of white men.

At home, at work and in civic spaces, it’s not uncommon to have conversations that make you question the intelligence and benevolence of your fellow human beings.

A natural reaction is to put forth the strongest argument for your own – clearly superior – perspective in the hope that logic and evidence will win the day. When that argument fails to have the intended persuasive impact, people often grow frustrated, and disagreement becomes conflict.

Thankfully, recent research offers a different approach.

For many years, psychologists have touted the benefits of making parties in conflict feel heard. Making someone you’re arguing with feel that you’re listening can calm the troubled waters, allowing both parties to get safely to the opposite shore. Two problems can get in the way, though.

First, when encountering disagreement, most people jump into “persuasion mode,” which doesn’t leave much room for listening, or even for pursuing other goals for the interaction. Any conversation could be an opportunity to learn something new, build a relationship that might bear fruit later, or simply have an interesting experience. But most of those goals get forgotten when the urge to persuade sets in. Second, and just as important, is that even when people do wish to make their counterparts feel heard they don’t know how to do so.

younger and older man in discussion across dining table
Pushing through your own perspective can feel like the only reason to engage. Maskot via Getty Images

I lead a team of psychologists, negotiation scholars and computational linguists who have spent years studying ways that parties in conflict can behave to make their counterpart feel they are thoughtfully engaging with their perspective.

Rather than trying to change how you think of or feel about your counterpart, our work suggests that you should focus on changing your own behavior. Focusing on behavior rather than thoughts and feelings has two benefits: You know when you are doing it right, and so does your counterpart. And one of the easiest behaviors to change is the words that you say.

A conversational toolbox, based on what works

We used the tools of computational linguistics to analyze thousands of interactions between people who disagree with each other on hot-button social and political issues: police brutality, campus sexual assault, affirmative action and COVID-19 vaccines. Based on these analyses, we developed an algorithm that picks out specific words and phrases that make people in conflict feel that their counterpart is thoughtfully engaging with their perspective.

These words and phrases comprise a communication style we call “conversational receptiveness.” People who use conversational receptiveness in their interactions are rated more positively by their conflict counterparts on a variety of traits.

Then we experimented with training people to use the words and phrases that have the most impact, even if they’re not naturally inclined to do so. For example, in one of our earlier studies, we had people who held different positions about the Black Lives Matter movement talk to each other.

Those who received a brief conversational receptiveness training were seen as more desirable teammates and advisers by their counterpart. Training also turned out to make people more persuasive in their arguments than those who did not learn about conversational receptiveness.

We encapsulate this conversational style in the simple acronym H.E.A.R.:

  • H = Hedge your claims, even when you feel very certain about your beliefs. It signals a recognition that there are some cases or some people who might support your opponent’s perspective.

  • E = Emphasize agreement. Find some common ground even when you disagree on a particular topic. This does not mean compromising or changing your mind, but rather recognizing that most people in the world can find some broad ideas or values to agree on.

  • A = Acknowledge the opposing perspective. Rather than jumping in to your own argument, devote a few seconds to restating the other person’s position to demonstrate that you did indeed hear and understand it.

  • R = Reframing to the positive. Avoid negative and contradictory words, such as “no,” “won’t” or “do not.” At the same time, increase your use of positive words to change the tone of the conversation.

Measuring benefits of the tools in practice

In a recent set of studies, my colleagues and I recruited people who were supportive of or hesitant about getting COVID-19 vaccinations. We paired vaccine-supportive participants with the vaccine hesitant and instructed them to persuade their partner to get the shot. Before the interaction, we randomly assigned the vaccine supporters to receive brief instructions in conversational receptiveness or guidance simply to use the best arguments they could think of.

We found that participants who received a couple minutes of instruction in conversational receptiveness were seen as more trustworthy and more reasonable by their counterparts. Their counterparts were also more willing to talk to them about other topics.

In a subsequent study, we explained the concept of conversational receptiveness to participants on both sides of the issue. Just knowing that they’d be engaging with someone trained in this technique made both parties report being 50% more willing to have a vaccine conversation. People felt more confident their discussion partner would hear them and less worried they’d be a dismissive jerk.

doctor speaking with patient and looking open
Conversational receptiveness can help keep both parties engaged. Science Photo Library via Getty Images

Dialing down the acrimony

This approach might be especially beneficial in conversations in which one party is highly motivated to engage while the other is less so. When such conversations turn contentious, the less motivated person can simply walk away.

That’s an all-too-familiar experience for parents of teenagers who seem to have advanced degrees in ignoring unwelcome advice. Health care providers often face a similar challenge when they try to persuade patients to change behaviors they do not wish to change. In the workplace, this burden is most acutely felt by people lower in the hierarchy trying to have their views heard by higher-ups who just don’t have to listen.

Conversational receptiveness is effective because it makes the interaction less confrontational and therefore less unpleasant. At the same time, it allows both parties to express their perspective. As a result, it gives people some confidence that if they approach a topic of disagreement, their partner will stay in the conversation, and the relationship will not sustain damage.

In recent years, many scholars across the social sciences have expressed concern about Americans’ seeming inability to talk to their political opponents.

Yet the skills that are necessary for Democrats and Republicans to engage with one another are similarly lacking in our families and in our workplaces.

Our work on conversational receptiveness builds on extensive prior research on the benefits of showing engagement with opposing perspectives. By focusing on language that can be easily learned and precisely measured, we offer people a broadly applicable toolkit to live up to their best conversational intentions.

Julia Minson, Associate Professor of Public Policy, Harvard Kennedy School

This article is republished from The Conversation under a Creative Commons license. 

How AI could take over elections – and undermine democracy

An AI-driven political campaign could be all things to all people. Eric Smalley, TCUS; Biodiversity Heritage Library/Flickr; Taymaz Valley/Flickr, CC BY-ND
Archon Fung, Harvard Kennedy School and Lawrence Lessig, Harvard University

Could organizations use artificial intelligence language models such as ChatGPT to induce voters to behave in specific ways?

Sen. Josh Hawley asked OpenAI CEO Sam Altman this question in a May 16, 2023, U.S. Senate hearing on artificial intelligence. Altman replied that he was indeed concerned that some people might use language models to manipulate, persuade and engage in one-on-one interactions with voters.

Altman did not elaborate, but he might have had something like this scenario in mind. Imagine that soon, political technologists develop a machine called Clogger – a political campaign in a black box. Clogger relentlessly pursues just one objective: to maximize the chances that its candidate – the campaign that buys the services of Clogger Inc. – prevails in an election.

While platforms like Facebook, Twitter and YouTube use forms of AI to get users to spend more time on their sites, Clogger’s AI would have a different objective: to change people’s voting behavior.

How Clogger would work

As a political scientist and a legal scholar who study the intersection of technology and democracy, we believe that something like Clogger could use automation to dramatically increase the scale and potentially the effectiveness of behavior manipulation and microtargeting techniques that political campaigns have used since the early 2000s. Just as advertisers use your browsing and social media history to individually target commercial and political ads now, Clogger would pay attention to you – and hundreds of millions of other voters – individually.

It would offer three advances over the current state-of-the-art algorithmic behavior manipulation. First, its language model would generate messages — texts, social media and email, perhaps including images and videos — tailored to you personally. Whereas advertisers strategically place a relatively small number of ads, language models such as ChatGPT can generate countless unique messages for you personally – and millions for others – over the course of a campaign.

Second, Clogger would use a technique called reinforcement learning to generate a succession of messages that become increasingly more likely to change your vote. Reinforcement learning is a machine-learning, trial-and-error approach in which the computer takes actions and gets feedback about which work better in order to learn how to accomplish an objective. Machines that can play Go, Chess and many video games better than any human have used reinforcement learning.

How reinforcement learning works.

Third, over the course of a campaign, Clogger’s messages could evolve in order to take into account your responses to the machine’s prior dispatches and what it has learned about changing others’ minds. Clogger would be able to carry on dynamic “conversations” with you – and millions of other people – over time. Clogger’s messages would be similar to ads that follow you across different websites and social media.

The nature of AI

Three more features – or bugs – are worth noting.

First, the messages that Clogger sends may or may not be political in content. The machine’s only goal is to maximize vote share, and it would likely devise strategies for achieving this goal that no human campaigner would have thought of.

One possibility is sending likely opponent voters information about nonpolitical passions that they have in sports or entertainment to bury the political messaging they receive. Another possibility is sending off-putting messages – for example incontinence advertisements – timed to coincide with opponents’ messaging. And another is manipulating voters’ social media friend groups to give the sense that their social circles support its candidate.

Second, Clogger has no regard for truth. Indeed, it has no way of knowing what is true or false. Language model “hallucinations” are not a problem for this machine because its objective is to change your vote, not to provide accurate information.

Third, because it is a black box type of artificial intelligence, people would have no way to know what strategies it uses.

The field of explainable AI aims to open the black box of many machine-learning models so people can understand how they work.

Clogocracy

If the Republican presidential campaign were to deploy Clogger in 2024, the Democratic campaign would likely be compelled to respond in kind, perhaps with a similar machine. Call it Dogger. If the campaign managers thought that these machines were effective, the presidential contest might well come down to Clogger vs. Dogger, and the winner would be the client of the more effective machine.

Political scientists and pundits would have much to say about why one or the other AI prevailed, but likely no one would really know. The president will have been elected not because his or her policy proposals or political ideas persuaded more Americans, but because he or she had the more effective AI. The content that won the day would have come from an AI focused solely on victory, with no political ideas of its own, rather than from candidates or parties.

In this very important sense, a machine would have won the election rather than a person. The election would no longer be democratic, even though all of the ordinary activities of democracy – the speeches, the ads, the messages, the voting and the counting of votes – will have occurred.

The AI-elected president could then go one of two ways. He or she could use the mantle of election to pursue Republican or Democratic party policies. But because the party ideas may have had little to do with why people voted the way that they did – Clogger and Dogger don’t care about policy views – the president’s actions would not necessarily reflect the will of the voters. Voters would have been manipulated by the AI rather than freely choosing their political leaders and policies.

Another path is for the president to pursue the messages, behaviors and policies that the machine predicts will maximize the chances of reelection. On this path, the president would have no particular platform or agenda beyond maintaining power. The president’s actions, guided by Clogger, would be those most likely to manipulate voters rather than serve their genuine interests or even the president’s own ideology.

Avoiding Clogocracy

It would be possible to avoid AI election manipulation if candidates, campaigns and consultants all forswore the use of such political AI. We believe that is unlikely. If politically effective black boxes were developed, the temptation to use them would be almost irresistible. Indeed, political consultants might well see using these tools as required by their professional responsibility to help their candidates win. And once one candidate uses such an effective tool, the opponents could hardly be expected to resist by disarming unilaterally.

Enhanced privacy protection would help. Clogger would depend on access to vast amounts of personal data in order to target individuals, craft messages tailored to persuade or manipulate them, and track and retarget them over the course of a campaign. Every bit of that information that companies or policymakers deny the machine would make it less effective.

Strong data privacy laws could help steer AI away from being manipulative.

Another solution lies with elections commissions. They could try to ban or severely regulate these machines. There’s a fierce debate about whether such “replicant” speech, even if it’s political in nature, can be regulated. The U.S.’s extreme free speech tradition leads many leading academics to say it cannot.

But there is no reason to automatically extend the First Amendment’s protection to the product of these machines. The nation might well choose to give machines rights, but that should be a decision grounded in the challenges of today, not the misplaced assumption that James Madison’s views in 1789 were intended to apply to AI.

European Union regulators are moving in this direction. Policymakers revised the European Parliament’s draft of its Artificial Intelligence Act to designate “AI systems to influence voters in campaigns” as “high risk” and subject to regulatory scrutiny.

One constitutionally safer, if smaller, step, already adopted in part by European internet regulators and in California, is to prohibit bots from passing themselves off as people. For example, regulation might require that campaign messages come with disclaimers when the content they contain is generated by machines rather than humans.

This would be like the advertising disclaimer requirements – “Paid for by the Sam Jones for Congress Committee” – but modified to reflect its AI origin: “This AI-generated ad was paid for by the Sam Jones for Congress Committee.” A stronger version could require: “This AI-generated message is being sent to you by the Sam Jones for Congress Committee because Clogger has predicted that doing so will increase your chances of voting for Sam Jones by 0.0002%.” At the very least, we believe voters deserve to know when it is a bot speaking to them, and they should know why, as well.

The possibility of a system like Clogger shows that the path toward human collective disempowerment may not require some superhuman artificial general intelligence. It might just require overeager campaigners and consultants who have powerful new tools that can effectively push millions of people’s many buttons.

Learn what you need to know about artificial intelligence by signing up for our newsletter series of four emails delivered over the course of a week. You can read all our stories on generative AI at TheConversation.com.

Archon Fung, Professor of Citizenship and Self-Government, Harvard Kennedy School and Lawrence Lessig, Professor of Law and Leadership, Harvard University

This article is republished from The Conversation under a Creative Commons license.

How wildfire smoke can harm human health, even when the fire is hundreds of miles away – a toxicologist explains

The sunset in Jersey City, N.J., glows orange through smoke from wildfires in Canada in May 2023. Gary Hershorn/Getty Images
Christopher T. Migliaccio, University of Montana

Smoke from more than 100 wildfires burning across Canada has been turning skies hazy in North American cities far from the flames. We asked Chris Migliaccio, a toxicologist at the University of Montana who studies the impact of wildfire smoke on human health, about the health risks people can face when smoke blows in from distant wildfires.

What’s in wildfire smoke that’s a problem?

When we talk about air quality, we often talk about PM2.5. That’s particulate matter 2.5 microns or smaller – small enough that it can travel deep into the lungs.

Exposure to PM2.5 from smoke or other air pollution, such as vehicle emissions, can exacerbate health conditions like asthma and reduce lung function in ways that can worsen existing respiratory problems and even heart disease.

But the term PM2.5 only tells you about size, not composition – what is burning can make a significant difference in the chemistry.

A map of North America shows where wildfire smoke from fires in Alberta, Canada, was detected across the U.S. and eastern Canada. Light smoke reached as far south as Texas and Georgia  but can be high in the air.
Smoke from wildfires in Canada was detected across a large part of the U.S. on May 22, 2023, in some areas high in the air. AirNow.gov

In the northern Rockies, where I live, most fires are fueled by vegetation, but not all vegetation is the same. If the fire is in the wildland urban interface, manufactured fuels from homes and vehicles may also be burning, and that’s going to create its own toxic chemistry, as well. Chemists often talk about volatile organic compounds, (VOCs), carbon monoxide and PAHs, or polycyclic aromatic hydrocarbons produced when biomass and other matter burns having the potential to harm human health.

How does inhaling wildfire smoke harm human health?

If you have ever been around a campfire and got a blast of smoke in your face, you probably had some irritation. With exposure to wildfire smoke, you might get some irritation in the nose and throat and maybe some inflammation. If you’re healthy, your body for the most part will be able to handle it.

As with a lot of things, the dose makes the poison – almost anything can be harmful at a certain dose.

Generally, cells in the lungs called alveolar macrophages will pick up the particulates and clear them out – at reasonable doses. It’s when the system gets overwhelmed that you can have a problem.

Illustration of a small section of lungs showing the alveoli and, within the alveoli, a close up of a microphage
Where macrophages are found in alveoli, the tiny air sacs in the lungs.

One concern is that smoke can suppress macrophage function, altering it enough that you become more susceptible to respiratory infection. A colleague who looked at lag time in the effect of wildfire smoke exposure found an increase in influenza cases after a bad fire season. Studies in developing countries have also found increases in respiratory infections with people who are cooking on open fires in homes.

The stress of an inflammatory response can also exacerbate existing health problems. Being exposed to wood smoke won’t independently cause someone to have a heart attack, but if they have underlying risk factors, such as significant plaque buildup, the added stress can increase the risk.

Researchers are also studying potential effects on the brain and nervous system from inhaled particulate matter.

When smoke blows over long distances, does its toxicity change?

We know that the chemistry of wildfire smoke changes. The longer it’s in the atmosphere, the more the chemistry will be altered by ultraviolet light, but we still have a lot to learn.

Researchers have found that there seems to be a higher level of oxidation, so oxidants and free radicals are being generated the longer smoke is in the air. The specific health effects aren’t yet clear, but there’s some indication that more exposure leads to greater health effects.

The supposition is that more free radicals are generated the longer smoke is exposed to UV light, so there’s a greater potential for health harm. A lot of that, again, comes down to dose.

A photo looking out at the Denver skyline shows a very hazy cities.
Denver was listed among the world’s worst cities for air pollution on May 19, 2023, largely because of the wildfire smoke from Canada. Colorado Air Pollution Control Division

Chances are, if you’re a healthy individual, going for a bike ride or a hike in light haze won’t be a big deal, and your body will be able to recover.

If you’re doing that every day for a month in wildfire smoke, however, that raises more concerns. I’ve worked on studies with residents at Seeley Lake in Montana who were exposed to hazardous levels of PM2.5 from wildfire smoke for 49 days in 2017. We found a decrease in lung function a year later. No one was on oxygen, but there was a significant drop.

This is a relatively new area of research, and there’s still a lot we’re learning, especially with the increase in wildfire activity as the planet warms.

What precautions can people take to reduce their risk from wildfire smoke?

If there is smoke in the air, you want to decrease your exposure.

Can you completely avoid the smoke? Not unless you’re in a hermetically sealed home. The PM levels aren’t much different indoors and out unless you have a really good HVAC system, such as those with MERV 15 or better filters. But going inside decreases your activity, so your breathing rate is slower and the amount of smoke you’re inhaling is likely lower.

A satellite animation shows smoke moving from fires in Alberta across Canada and into New England.
A satellite captures wildfire smoke on May 16, 2023. NASA EarthData

We also tend to advise people that if you’re in a susceptible group, such as those with asthma, create a safe space at home and in the office with a high-level stand-alone air filtration system to create a space with cleaner air.

Some masks can help. It doesn’t hurt to have a high-quality N95 mask. Just wearing a cloth mask won’t do much, though.

Most states have air quality monitors that can give you a sense of how bad the air quality is, so check those sites and act accordingly.

This article was updated May 26, 2023, with over 100 fires now burning.

Christopher T. Migliaccio, Research Associate Professor in Toxicology, University of Montana

This article is republished from The Conversation under a Creative Commons license. 

5 Natural Wound Care Solutions

Many people look for natural products with “clean” ingredients, especially in the food, beverage, skin care and beauty categories. In fact, the market for clean label ingredients is projected to reach $64.1 billion by 2026, according to Allied Market Research.

For many common ailments or minor injuries, there’s a natural treatment that can be used in place of hard-to-pronounce ingredients and preservatives.

“This same kind of clean ingredient demand is migrating to the first-aid space with many of these natural alternatives being used to treat anything from scrapes and bug bites to wound odor and pulled or sore muscles,” said Dr. Billy Goldberg, a “New York Times” best-selling authorand emergency room physician. “In fact, some companies are beginning to incorporate these kinds of natural and efficacious ingredients right into their products.”

Goldberg and the first-aid experts at CURAD, which have made adhesive bandages since 1951, offer these suggestions for natural ingredients you can use at home to treat common ailments:

Epsom Salt – Named for a bitter saline spring at Epsom in Surrey, England, Epsom salt is not actually salt but a naturally occurring mineral compound of magnesium sulfate. Long known as a natural remedy for several ailments, Epsom salt can be used to relax muscles and relieve pain in the shoulders, neck and back. It can also be applied to sunburns or dissolved in the bath to help relieve sore muscles or detox.

Aloe Vera – Few things soothe sunburn like aloe vera. With analgesic, anti-inflammatory and soothing properties that ease the healing process, aloe vera gel contains phytochemicals that help reduce pain and inflammation. Also helpful in the healing process of cuts and scrapes, the CURAD Naturals line of adhesive bandages are infused with aloe vera in the wound pad and surface of the bandage, which is enriched with the antioxidant vitamin E to help soothe and moisturize skin.

Hydrogen Peroxide – A mild antiseptic that can be used to prevent infection of minor cuts, scrapes and burns, hydrogen peroxide is often used for the initial cleaning of wounds. Simply apply a small amount on the affected area – alternating with water to avoid killing good bacteria – to help release oxygen, which causes foaming that aids in cleaning and the removal of dead skin.

Baking Soda – Bicarbonate of soda, commonly known as baking soda, can be used for more than baking. From removing stains to cleaning teeth and more, it can also be used to help treat a variety of wounds. In addition to being an odor absorber, it can be applied to insect stings and bites, such as those from bees or mosquitoes.

Whether making a paste using baking soda and water then applying to the bite or using an option like CURAD Naturals adhesive bandages featuring baking soda, the chemical compound can help soothe the skin. In addition to absorbing wound odor, the bandages provide skin-friendly comfort and stretch with a four-sided seal to keep dirt and germs out.

Manuka Honey – A honey native to New Zealand, manuka honey contains methylglyoxal as an active ingredient and has unique antibacterial properties that speed healing and help prevent and fight infections when applied as a topical wound treatment. It may also help soothe coughs and sore throats, prevent tooth decay and improve digestive issues.

Learn more about natural first-aid products at CURAD.com.

SOURCE:
CURAD

Getting Social Security on a more stable path is hard but essential – 2 experts suggest a way forward

No big Social Security reforms have taken effect since the Reagan administration. David Hume Kennerly/Getty Images
Andrew Rettenmaier, Texas A&M University and Dennis W. Jansen, Texas A&M University

Social Security is in trouble.

The retirement and disability program has been running a cash-flow deficit since 2010. Its trust fund, which holds US$2.7 trillion, is rapidly diminishing. Social Security’s trustees, a group that includes the secretaries of the departments of Treasury, Labor, and Health and Human Services, as well as the Social Security commissioner, project that the trust fund will be completely drained by 2033.

Under current law, when that trust fund is empty, Social Security can pay benefits only from dedicated tax revenues, which would by that point cover about 77% of promised benefits. Another way to say this is that when the trust fund is depleted, under current law, Social Security beneficiaries would see a sudden 23% cut in their monthly checks in 2034.

As economists who study the Medicare and Social Security programs, we view the above scenario as politically unacceptable. Such a sudden and dramatic benefit cut would anger a lot of voters. Unfortunately, the actions necessary now to avoid it – like raising taxes or cutting benefits – aren’t getting serious consideration today. But we believe there are strategies that could work.

Where the money for benefits comes from

Roughly 67 million Americans, most of whom are 65 or older, receive Social Security benefits. The agency disburses more than $1 trillion annually. It’s the government’s largest single expenditure, constituting nearly 20% of the total federal budget.

Social Security is funded by a payroll tax of 12.4% on wages split equally between workers and employers. Self-employed people pay the entire 12.4%. This payroll tax applies to earnings up to $160,200 as of 2023. The government increases this cap annually based on increases in the National Average Wage Index – a measure that combines wage growth and inflation. The program also receives about 4% of its revenue from a tax on Social Security benefits, though not everyone who receives them has to pay this tax.

Social Security tax revenue stayed relatively flat after 1990. But the costs of the program rose sharply in 2010, in part because of early retirements in response to the Great Recession.

Social Security spending has recently been growing more rapidly because of a wave of baby boomer retirements, which added to a decline in the number of workers per retiree.

Costs of the program are expected to further exceed the money that’s coming in, which will continue to drain the trust fund, according to the program’s trustees.

Barring immediate action by the government, the trust fund’s exhaustion is only a little more than a decade away. And yet few members of Congress seem willing to do something about it. For example, Social Security reform was not even on the table during the 2023 negotiations over the debt ceiling and spending cuts.

Trust fund

Where did the trust fund, which helps cover the program’s costs, come from?

While the Social Security program was collecting surpluses from 1984 to 2009, that extra money funded other spending – keeping other taxes lower than they would have been otherwise and partially covering the budget deficit.

During Social Security’s years of surplus, the excess revenues were credited to the trust fund in the form of special-issue government bonds that yielded the prevailing interest rates. When those bonds are needed to pay for Social Security expenses, the Treasury redeems them.

Those bonds are components of the government’s $31.4 trillion gross debt.

Last reformed during the Reagan administration

Reducing the benefits current retirees receive would be extremely unpopular. Likewise, people now in the workforce who are nearing retirement would certainly object strongly if they were told to expect lower benefits in retirement than they have been promised throughout their careers.

The last time the government made big changes to Social Security was in 1983, during the Reagan administration, when the government enacted reforms that slowly reduced benefits over time. These changes included raising the full retirement age, a change that is still being phased in. Because of those changes, workers born in 1960 or later cannot retire with full benefits until age 67 – two years later than the original retirement age.

The 1983 reforms also included increases in the Social Security payroll tax rate from 10.4% in 1983 to 12.4% by 1990, and for the first time levied federal income taxes on higher-income retirees’ benefits. Workers bore the burden of the payroll tax increases and higher-income retirees bore the burden of the tax on benefits.

Those changes bolstered the program’s finances, but they no longer suffice.

The bipartisan 2001 Commission to Strengthen Social Security tried – and failed – during George W. Bush’s presidency to get Congress to enact reforms to shore up the program’s finances. There’s been no momentum toward resolving the problem since then.

A man with gray hair sits at a table in front of a giant replica of a Social Security card.
George W. Bush sought to reform Social Security early in his presidency. Brooks Kraft LLC/Sygma via Getty Images

4 principles

We believe that policymakers and lawmakers need to follow four principles as they consider how to move forward.

  1. The program should be self-funded in the long run so that its annual revenues match its annual expenses. That way the many questions that arise related to trust fund accounting and whether Social Security tax revenues are being used for their intended purposes would be eliminated.

  2. The reform burden should be shared across generations. Current retirees can share the burden through a reform that reduces the cost-of-living adjustment. Today’s workers can share the burden through an increase in the cap on income subjected to Social Security taxes so that 90% of total earnings are taxed. Continued gradual increases in the retirement age to keep pace with anticipated longevity gains would also be borne by current workers.

  3. The government should make sure that Social Security benefits will be adequate for lower-income retirees for years to come. That means reforms that slow the benefit growth of future retirees would be designed to affect only higher-income retirees.

  4. Any changes to Social Security should help constrain the future growth of federal spending, given the current and projected growth in the budget deficit.

Advantages of ending the delay

It appears that the U.S. – citizens and elected officials included – are deferring serious debate on this urgent matter until the trust fund’s depletion is imminent. That’s unwise. Acting sooner rather than later would leave more options available to gradually resolve the program’s financial shortfalls.

Ending this procrastination would also give the millions of people who rely on Social Security benefits, taxpayers and businesses more time to prepare for any changes required by overdue reforms.

Andrew Rettenmaier, Executive Associate Director of the Private Enterprise Research Center, Texas A&M University and Dennis W. Jansen, Professor of Economics and Director of the Private Enterprise Research Center, Texas A&M University

This article is republished from The Conversation under a Creative Commons license.