22.1 The Problem of Imperfect Information and Asymmetric Information

Learning Objectives

By the end of this section, you will be able to:
  • Analyze the impact of both imperfect information and asymmetric information
  • Evaluate the role of advertisements in creating imperfect information
  • Identify ways to reduce the risk of imperfect information
  • Explain how imperfect information can affect price, quantity, and quality

Consider a purchase that many people make at important times in their lives: buying expensive jewelry. In May 1994, Doree Lynn bought an expensive ring from a jeweler in Washington, D.C., which included an emerald that cost $14,500. Several years later, the emerald fractured. Lynn took it to another jeweler who found that cracks in the emerald had been filled with an epoxy resin. Lynn sued the original jeweler in 1997 for selling her a treated emerald without telling her, and won. The case publicized a number of little-known facts about precious stones. Most emeralds have internal flaws, and so they are soaked in clear oil or an epoxy resin to hide the flaws and make the color more deep and clear. Clear oil can leak out over time, and epoxy resin can discolor with age or heat. However, using clear oil or epoxy to “fill” emeralds is completely legal, as long as it is disclosed.

After Doree Lynn’s lawsuit, the NBC news show “Dateline” bought emeralds at four prominent jewelry stores in New York City in 1997. All the sales clerks at these stores, unaware that they were being recorded on a hidden camera, said the stones were untreated. When the emeralds were tested at a laboratory, however, it was discovered they had all been treated with oil or epoxy. Emeralds are not the only gemstones that are treated. Diamonds, topaz, and tourmaline are also often irradiated to enhance colors. The general rule is that all treatments to gemstones should be revealed, but often disclosure is not made. As such, many buyers face a situation of asymmetric information, where the both parties involved in an economic transaction have an unequal amount of information (one party knows much more than the other).

Many economic transactions are made in a situation of imperfect information, where either the buyer, the seller, or both, are less than 100% certain about the qualities of what is being bought and sold. Also, the transaction may be characterized by asymmetric information, in which one party has more information than the other regarding the economic transaction. Let’s begin with some examples of how imperfect information complicates transactions in goods, labor, and financial capital markets. The presence of imperfect information can easily cause a decline in prices or quantities of products sold. However, buyers and sellers also have incentives to create mechanisms that will allow them to make mutually beneficial transactions even in the face of imperfect information.

If you are unclear about the difference between asymmetric information and imperfect information, read the following Clear It Up feature.

What is the difference between imperfect and asymmetric information?

For a market to reach equilibrium sellers and buyers must have full information about the product’s price and quality. If there is limited information, then buyers and sellers may not be able to transact or will possibly make poor decisions.

Imperfect information refers to the situation where buyers and/or sellers do not have all of the necessary information to make an informed decision about the price or quality of a product. The term imperfect information simply means that not all the information necessary to make an informed decision is known to the buyers and/or sellers. Asymmetric information is the condition where one party, either the buyer or the seller, has more information about the quality or price of the product than the other party. In either case (imperfect or asymmetric information) buyers or sellers need remedies to make more informed decisions.

“Lemons” and Other Examples of Imperfect Information

Consider Marvin, who is trying to decide whether to buy a used car. Let’s assume that Marvin is truly clueless about what happens inside a car’s engine. He is willing to do some background research, like reading Consumer Reports or checking websites that offer information about makes and models of used cars and what they should cost. He might pay a mechanic to inspect the car. Even after devoting some money and time collecting information, however, Marvin still cannot be absolutely sure that he is buying a high-quality used car. He knows that he might buy the car, drive it home, and use it for a few weeks before discovering that car is a “lemon,” which is slang for a defective product (especially a car).

Imagine that Marvin shops for a used car and finds two that look very similar in terms of mileage, exterior appearances, and age. One car costs $4,000, while the other car costs $4,600. Which car should Marvin buy?

If Marvin was choosing in a world of perfect information, the answer would be simple: he should buy the cheaper car. But Marvin is operating in a world of imperfect information, where the sellers likely know more about the car’s problems than he does, and have an incentive to hide the information. After all, the more problems that are disclosed, the lower the car’s selling price.

What should Marvin do? First, he needs to understand that even with imperfect information, prices still reflect information. Typically, used cars are more expensive on some dealer lots because the dealers have a trustworthy reputation to uphold. Those dealers try to fix problems that may not be obvious to their customers, in order to create good word of mouth about their vehicles’ long term reliability. The short term benefits of selling their customers a “lemon” could cause a quick collapse in the dealer’s reputation and a loss of long term profits. On other lots that are less well-established, one can find cheaper used cars, but the buyer takes on more risk when a dealer’s reputation has little at stake. The cheapest cars of all often appear on Craigslist, where the individual seller has no reputation to defend. In sum, cheaper prices do carry more risk, so Marvin should balance his appetite for risk versus the potential headaches of many more unanticipated trips to the repair shop.

Similar problems with imperfect information arise in labor and financial capital markets. Consider Greta, who is applying for a job. Her potential employer, like the used car buyer, is concerned about ending up with a “lemon”—in this case a poor quality employee. The employer will collect information about Greta’s academic and work history. In the end, however, a degree of uncertainty will inevitably remain regarding Greta’s abilities, which are hard to demonstrate without actually observing her on the job. How can a potential employer screen for certain attributes, such as motivation, timeliness, ability to get along with others, and so on? Employers often look to trade schools and colleges to pre-screen candidates. Employers may not even interview a candidate unless he has a degree and, sometimes, a degree from a particular school. Employers may also view awards, a high grade point average, and other accolades as a signal of hard work, perseverance, and ability. Employers may also seek references for insights into key attributes such as energy level, work ethic, and so on.

How Imperfect Information Can Affect Equilibrium Price and Quantity

The presence of imperfect information can discourage both buyers and sellers from participating in the market. Buyers may become reluctant to participate because they cannot determine the quality of a product. Sellers of high-quality or medium-quality goods may be reluctant to participate, because it is difficult to demonstrate the quality of their goods to buyers—and since buyers cannot determine which goods have higher quality, they are likely to be unwilling to pay a higher price for such goods.

A market with few buyers and few sellers is sometimes referred to as a thin market. By contrast, a market with many buyers and sellers is called a thick market. When imperfect information is severe and buyers and sellers are discouraged from participating, markets may become extremely thin as a relatively small number of buyer and sellers attempt to communicate enough information that they can agree on a price.

When Price Mixes with Imperfect Information about Quality

A buyer confronted with imperfect information will often believe that the price being charged reveals something about the quality of the product. For example, a buyer may assume that a gemstone or a used car that costs more must be of higher quality, even though the buyer is not an expert on gemstones. Think of the expensive restaurant where the food must be good because it is so expensive or the shop where the clothes must be stylish because they cost so much, or the gallery where the art must be great, because it costs so much. If you are hiring a lawyer, you might assume that a lawyer who charges $400 per hour must be better than a lawyer who charges $150 per hour. In these cases, price can act as a signal of quality.

When buyers use the market price to draw inferences about the quality of products, then markets may have trouble reaching an equilibrium price and quantity. Imagine a situation where a used car dealer has a lot full of used cars that do not seem to be selling, and so the dealer decides to cut the prices of the cars to sell a greater quantity. In a market with imperfect information, many buyers may assume that the lower price implies low-quality cars. As a result, the lower price may not attract more customers. Conversely, a dealer who raises prices may find that customers assume that the higher price means that cars are of higher quality; as a result of raising prices, the dealer might sell more cars. (Whether or not consumers always behave rationally, as an economist would see it, is the subject of the following Clear It Up feature.)

The idea that higher prices might cause a greater quantity demanded and that lower prices might cause a lower quantity demanded runs exactly counter to the basic model of demand and supply (as outlined in the Demand and Supply chapter). These contrary effects, however, will reach natural limits. At some point, if the price is high enough, the quantity demanded will decline. Conversely, when the price declines far enough, buyers will increasingly find value even if the quality is lower. In addition, information eventually becomes more widely known. An overpriced restaurant that charges more than the quality of its food is worth to many buyers will not last forever.

Is consumer behavior rational?

There is a lot of human behavior out there that mainstream economists have tended to call “irrational” since it is consistently at odds with economists’ utility maximizing models. The typical response is for economists to brush these behaviors aside and call them “anomalies” or unexplained quirks.

“If only you knew more economics, you would not be so irrational,” is what many mainstream economists seem to be saying. A group known as behavioral economists has challenged this notion, because so much of this so-called “quirky” behavior is extremely common among us. For example, a conventional economist would say that if you lost a $10 bill today, and also got an extra $10 in your paycheck, you should feel perfectly neutral. After all, –$10 + $10 = $0. You are the same financially as you were before. However, behavioral economists have done research that shows many people will feel some negative emotion—anger, frustration, and so forth—after those two things happen. We tend to focus more on the loss than the gain. This is known as “loss aversion,” where a $1 loss pains us 2.25 times more than a $1 gain helps us, according to the economists Daniel Kahneman and Amos Tversky in a famous 1979 Econometrica paper. This has implications for investing, as people tend to “overplay” the stock market by reacting more to losses than to gains.

Behavioral economics also tries to explain why people make seemingly irrational decisions in the presence of different situations, or how the decision is “framed.” A popular example is outlined here: Imagine you have the opportunity to buy an alarm clock for $20 in Store A. Across the street, you learn, is the exact same clock at Store B for $10. You might say it is worth your time—a five minute walk—to save $10. Now, take a different example: You are in Store A buying a $300 phone. Five minutes away, at Store B, the same phone is $290. You again save $10 by taking a five minute walk. Do you do it?

Surprisingly, it is likely that you would not. Mainstream economists would say “$10 is $10” and that it would be irrational to make a five minute walk for $10 in one case and not the other. However, behavioral economists have pointed out that most of us evaluate outcomes relative to a reference point—here the cost of the product—and think of gains and losses as percentages rather than using actual savings.

Which view is right? Both have their advantages, but behavioral economists have at least shed a light on trying to describe and explain systematic behavior which previously has been dismissed as irrational. If most of us are engaged in some “irrational behavior,” perhaps there are deeper underlying reasons for this behavior in the first place.

Mechanisms to Reduce the Risk of Imperfect Information

If you were selling a good like emeralds or used cars where imperfect information is likely to be a problem, how could you reassure possible buyers? If you were buying a good where imperfect information is a problem, what would it take to reassure you? Buyers and sellers in the goods market rely on reputation as well as guarantees, warrantees, and service contracts to assure product quality; in the labor market, occupational licenses and certifications are used to assure competency, while in financial capital market cosigners and collateral are used as insurance against unforeseen, detrimental events.

In the goods market, the seller of a good might offer a money-back guarantee, an agreement that functions as a promise of quality. This strategy may be especially important for a company that sells goods through mail-order catalogs or over the web, whose customers cannot see the actual products, because it encourages people to buy something even if they are not certain they want to keep it.

L.L. Bean started using money-back-guarantees in 1911, when the founder stitched waterproof shoe rubbers together with leather shoe tops, and sold them as hunting shoes. He guaranteed satisfaction. However, the stitching came apart and, out of the first batch of 100 pairs that were sold, 90 pairs were returned. L.L. Bean took out a bank loan, repaired all of the shoes, and replaced them. The L.L. Bean reputation for customer satisfaction began to spread. Many firms today offer money-back-guarantees for a few weeks or months, but L.L. Bean offers a complete money-back guarantee. Anything you have bought from L.L. Bean can always be returned, no matter how many years later or what condition the product is in, for a full money-back guarantee.

L.L. Bean has very few stores. Instead, most of its sales are made by mail, telephone, or, now, through their website. For this kind of firm, imperfect information may be an especially difficult problem, because customers cannot see and touch what they are buying. A combination of a money-back guarantee and a reputation for quality can help for a mail-order firm to flourish.

Visit this website to read about the origin of Eddie Bauer’s 100% customer satisfaction guarantee.


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Sellers may offer a warranty, which is a promise to fix or replace the good, at least for a certain period of time. The seller may also offer a buyer a chance to buy a service contract, where the buyer pays an extra amount and the seller agrees to fix anything that goes wrong for a set time period. Service contracts are often used with large purchases such as cars, appliances and even houses.

Guarantees, warranties, and service contracts are examples of explicit reassurance that sellers provide. In many cases, firms also offer unstated guarantees. For example, some movie theaters might refund the cost of a ticket to a customer who walks out complaining about the show. Likewise, while restaurants do not generally advertise a money-back guarantee or exchange policies, many restaurants allow customers to exchange one dish for another or reduce the price of the bill if the customer is not satisfied.

The rationale for these policies is that firms want repeat customers, who in turn will recommend the business to others; as such, establishing a good reputation is of paramount importance. When buyers know that a firm is concerned about its reputation, they are less likely to worry about receiving a poor-quality product. For example, a well-established grocery store with a good reputation can often charge a higher price than a temporary stand at a local farmer’s market, where the buyer may never see the seller again.

Sellers of labor provide information through resumes, recommendations, school transcripts, and examples of their work. Occupational licenses are also used to establish quality in the labor market. Occupational licenses, which are typically issued by government agencies, show that a worker has completed a certain type of education or passed a certain test. Some of the professionals who must hold a license are doctors, teachers, nurses, engineers, accountants, and lawyers. In addition, most states require a license to work as a barber, an embalmer, a dietitian, a massage therapist, a hearing aid dealer, a counselor, an insurance agent, and a real estate broker. Some other jobs require a license in only one state. Minnesota requires a state license to be a field archeologist. North Dakota has a state license for bait retailers. In Louisiana, a state license is needed to be a “stress analyst” and California requires a state license to be a furniture upholsterer. According to a 2013 study from the University of Chicago, about 29% of U.S. workers have jobs that require occupational licenses.

Occupational licenses have their downside as well, as they represent a barrier to entry to certain industries. This makes it more difficult for new entrants to compete with incumbents, which can lead to higher prices and less consumer choice. In industries that require licenses, the government has decided that the additional information provided by licenses outweighs the negative effect on competition.

Are advertisers allowed to benefit from imperfect information?

Many advertisements seem full of imperfect information—at least by what they imply. Driving a certain car, drinking a particular soda, or wearing a certain shoe are all unlikely to bring fashionable friends and fun automatically, if at all. The government rules on advertising, enforced by the Federal Trade Commission (FTC), allow advertising to contain a certain amount of exaggeration about the general delight of using a product. They, however, also demand that if a claim is presented as a fact, it must be true.

Legally, deceptive advertising dates back to the 1950s when Colgate-Palmolive created a television advertisement that seemed to show Rapid Shave shaving cream being spread on sandpaper and then the sand was shaved off the sandpaper. What the television advertisement actually showed was sand sprinkled on Plexiglas—without glue—and then scraped aside by the razor.

In the 1960s, in magazine advertisements for Campbell’s vegetable soup, the company was having problems getting an appetizing picture of the soup, because the vegetables kept sinking. So they filled a bowl with marbles and poured the soup over the top, so that the bowl appeared to be crammed with vegetables.

In the late 1980s, the Volvo Company filmed a television advertisement that showed a monster truck driving over cars, crunching their roofs—all except for the Volvo, which did not crush. However, the FTC found in 1991 that the roof of the Volvo used in the filming had been reinforced with an extra steel framework, while the roof supports on the other car brands had been cut.

The Wonder Bread Company ran television advertisements featuring “Professor Wonder,” who said that because Wonder Bread contained extra calcium, it would help children’s minds work better and improve their memory. The FTC objected, and in 2002 the company agreed to stop running the advertisements.

As can be seen in each of these cases, factual claims about the product’s performance are often checked, at least to some extent, by the Federal Trade Commission. Language and images that are exaggerated or ambiguous, but not actually false, are allowed in advertising. Untrue “facts” are not allowed. In any case, an old Latin saying applies when watching advertisements: Caveat emptor—that is, “let the buyer beware.”

On the buyer’s side of the labor market, a standard precaution against hiring a “lemon” of an employee is to specify that the first few months of employment are officially a trial or probationary period, and that the worker can be let go for any reason or no reason after that time. Sometimes workers also receive lower pay during this trial period.

In the financial capital market, before a bank makes a loan, it requires a prospective borrower fill out forms regarding the sources of income; in addition, the bank conducts a credit check on the individual’s past borrowing. Another approach is to require a cosigner on a loan; that is, another person or firm who legally pledges to repay some or all of the money if the original borrower does not do so. Yet another approach is to require collateral, often property or equipment that the bank would have a right to seize and sell if the loan is not repaid.

Buyers of goods and services cannot possibly become experts in evaluating the quality of gemstones, used cars, lawyers, and everything else they buy. Employers and lenders cannot be perfectly omniscient about whether possible workers will turn out well or potential borrowers will repay loans on time. But the mechanisms mentioned above can reduce the risks associated with imperfect information so that the buyer and seller are willing to proceed.

Key Concepts and Summary

Many economic transactions are made in a situation of imperfect information, where either the buyer, the seller, or both are less than 100% certain about the qualities of what is being bought and sold. When information about the quality of products is highly imperfect, it may be difficult for a market to exist.

A “lemon” is the name given to a product that turns out, after the purchase, to have low quality. When the seller has more accurate information about the quality of the product than the buyer, the buyer will be hesitant to buy, out of fear of purchasing a “lemon.”

Markets have many ways to deal with imperfect information. In goods markets, buyers facing imperfect information about products may depend upon money-back guarantees, warranties, service contracts, and reputation. In labor markets, employers facing imperfect information about potential employees may turn to resumes, recommendations, occupational licenses for certain jobs, and employment for trial periods. In capital markets, lenders facing imperfect information about borrowers may require detailed loan applications and credit checks, cosigners, and collateral.

Self-Check Questions

  1. For each of the following purchases, say whether you would expect the degree of imperfect information to be relatively high or relatively low:
    1. Buying apples at a roadside stand
    2. Buying dinner at the neighborhood restaurant around the corner
    3. Buying a used laptop computer at a garage sale
    4. Ordering flowers over the Internet for your friend in a different city
  2. Why is there asymmetric information in the labor market? What signals can an employer look for that might indicate the traits they are seeking in a new employee?

Review Questions

  1. Why might it be difficult for a buyer and seller to agree on a price when imperfect information exists?
  2. What do economists (and used-car dealers) mean by a “lemon”?
  3. What are some of the ways a seller of goods might reassure a possible buyer who is faced with imperfect information?
  4. What are some of the ways a seller of labor (that is, someone looking for a job) might reassure a possible employer who is faced with imperfect information?
  5. What are some of the ways that someone looking for a loan might reassure a bank that is faced with imperfect information about whether the loan will be repaid?

Critical Thinking Questions

  1. You are on the board of directors of a private high school, which is hiring new tenth-grade science teachers. As you think about hiring someone for a job, what are some mechanisms you might use to overcome the problem of imperfect information?
  2. A website offers a place for people to buy and sell emeralds, but information about emeralds can be quite imperfect. The website then enacts a rule that all sellers in the market must pay for two independent examinations of their emerald, which are available to the customer for inspection.
    1. How would you expect this improved information to affect demand for emeralds on this website?
    2. How would you expect this improved information to affect the quantity of high-quality emeralds sold on the website?

Problems

Using Critical Thinking Question 2, sketch the effects in parts (a) and (b) on a single supply and demand diagram. What prediction would you make about how the improved information alters the equilibrium quantity and price?

References

Center on Budget and Policy Priorities. 2015. “Policy Basics: Where Do Our Federal Tax Dollars Go?” Accessed April 1, 2015. http://www.cbpp.org/cms/?fa=view&id=1258.

Consumer Reports. “Consumer Reports.org.” http://www.consumerreports.org/cro/index.htm.

Federal Trade Commission. “About the Federal Trade Commission.” Last modified October 17, 2013. http://www.ftc.gov/ftc/about.shtm.

Huffington Post. 2015. “HUFFPOLLSTER: Poll Shows Uptick In Obamacare Favorable Rating.” Accessed April 1, 2015. http://www.huffingtonpost.com/2015/03/19/affordable-care-act-fav_n_6900938.html.

Kahneman, Daniel, and Amos Tversky. “Prospect Theory: An Analysis of Decision under Risk.” Econometrica. 47, no. 2 (1979): 263-291. http://www.princeton.edu/~kahneman/docs/Publications/prospect_theory.pdf.

Rasmussen Reports, LLC. “Rasmussen Reports.” http://www.rasmussenreports.com/.

Glossary

asymmetric information
a situation where the seller or the buyer has more information than the other regarding the quality of the item being sold
collateral
something valuable—often property or equipment—that a lender would have a right to seize and sell if the loan is not repaid
cosigner
another person or firm who legally pledges to repay some or all of the money on a loan if the original borrower does not do so
imperfect information
a situation where either the buyer or the seller, or both, are uncertain about the qualities of what is being bought and sold
money-back guarantee
a promise that the buyer’s money will be refunded under certain conditions
occupational license
licenses issued by government agencies, which indicate that a worker has completed a certain type of education or passed a certain test
service contract
the buyer pays an extra amount and the seller agrees to fix anything specified in the contract that goes wrong for a set time period
warranty
a promise to fix or replace the good for a certain period of time

Solutions

Answers to Self-Check Questions

    1. Imperfect information is relatively low; after all, you can see the apples.
    2. Imperfect information is relatively low. The neighborhood restaurant probably has a certain local reputation.
    3. Imperfect information is relatively high. How can you tell whether the computer is really in good working order? Why are they selling it?
    4. Imperfect information is relatively high. What do those flowers really look like?
  1. Asymmetric information often exists in the labor market because employers cannot observe many key employee attributes until after the person is hired. Employees, however, know whether they are energetic or detailed-oriented. Employers, therefore, often seek schools to pre-screen candidates. Employers may not even interview a candidate unless he has a degree and often a degree from a particular school. Employers may also view awards, a high grade point average, and other accolades as a signal of hard work, perseverance, and ability. Finally, employers seek references for insights into key attributes such as energy level, work ethic, and so on.

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