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Asymmetric Information & Market Failure

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|Discuss the reasons why asymmetric information can be a source of market failure. Use examples to illustrate your answers. |
|By Andrew Sweeting |
|November 1998 |
|Introduction |
|This essay is concerned with the issue of information in microeconomics, particularly where information is a factor in the failure of|
|individual markets in an economy. Economic information and its importance in microeconomics is initially discussed, and continues |
|with defining asymmetric information, which is a factor that can lead to a market failure. |
|In the analysis of asymmetric information in markets, ex ante and ex post asymmetries information are discussed in relation to market|
|transactions. Ex ante asymmetric information can be explained through Adverse Selection in relation to quality of goods in the |
|product market, and ex post asymmetric information can be explained through Moral Hazard in insurance markets. Strategies to correct |
|market failure(s) caused by these information asymmetries is addressed for each example discussed. |
|The exposition of these two types of asymmetric information problems leads to the discussion of principal-agent problems, |
|particularly in relation to efficiency wage theory, which have been developed to analyse market failures. Labour market failure |
|explained through the efficiency wage theory has been used to explain involuntary unemployment. |
|Economics of Information |
|"Economics is concerned with the efficient use of limited productive resources for the purpose of attaining the maximum satisfaction |
|of our material wants"(Jackson and McConnell,1985,p.3), which involves economic agents undertaking transactions that utilize these |
|resources to meet and satisfy their wants. By way of analysing these market transactions, economist have developed microeconomic |
|models, such as perfect competition, to explain the interactions in individual markets. Much of this analysis has been undertaken on |
|the critical assumption of economic agents having full information about the goods or services being bought or sold, and full |
|information about each other. These assumptions describe a market where there is perfect information(Stiglitz,1993). |
|Stigler(1961) states that "information is a valuable resource: knowledge is power"(p.213), and information can determine actions such|
|as where purchasers buy higher quality goods at lower prices in their allocation of scare resources(money), or where Governments |
|regulation of the environment can be more efficient if they have the good scientific information. Therefore information can be seen |
|as a valuable economic factor, especially in the allocation of scare economic resources, and the level of uncertainty that can |
|ultimately determine utility levels(Nicholson,1998). |
|With microeconomic assumptions of perfect information in economic models, economists do not represent real world situations. e.g. |
|households do not know the price of a particular good at every store that sells it, or firms do not know the actual productivity of |
|every job applicant for a vacant position. Therefore there is imperfect information in individual markets, for reasons such as |
|accurate information being too costly, or impossible to obtain, for important decision characteristics. The lack of information in a |
|market transaction may be only one sided, or be evident to both parties(Stiglitz,1993)(Varian,1990). |
|Asymmetric Information |
|Definition |
|Asymmetric information is a situation in which economic agents involved in a transaction have different information, as when the a |
|private motorcycle seller has more detailed information about the its quality than the prospective purchaser, or an employee will |
|know more about their ability than their employer. Information that is distributed asymmetrically between economic agents can be |
|categorized as ex ante, pre-contractual of the transaction, or ex post, post-contractual of the transaction, that will influence |
|economic behaviour and operation of the market(Stiglitz,1993). |
|These two forms of asymmetric information, ex ante -Adverse Selection- and ex post -Moral Hazard- are foundations in the explanation |
|of insurance market theory and therefore much of informational asymmetry explanations involve examples relating to insurance markets |
|and their inefficiencies/failures. |
|Adverse Selection |
|Adverse selection is a situation where one party in a transaction knows something about its own characteristic that the other party |
|does not know. Adverse selection is often referred to as a hidden information problem in a market, where for example sellers may know|
|more about a product than a customer(Estrin and Laidler,1995). |
|Information asymmetry and adverse selection was first pioneered by George Akerlof in his article "The Market for Lemons: Quality |
|Uncertainty and the Market Mechanism", which examined the markets for used motor vehicles, insurance, credit and employment. Akerlof |
|explores adverse selection by the use of asymmetric quality information about the purchase of used motor vehicles to show market |
|failure. The following example looks at adverse selection in the insurance market(Estrin and Laidler,1995). |
|Example: Motor Vehicle Market(Quality) |
|Akerlof(1970) posed a question as to why there is such a large price difference in new motor vehicle and those that have just left |
|the showroom. Akerlof developed the concept of asymmetric information about the motor vehicles quality because the sellers knows more|
|about the motor vehicle than the buyer. Buyers with a lack of knowledge about the motor vehicle would ask the question, why is it for|
|sale? - is it a "lemon"? Therefore all prospective buyers would be suspicious of the quality of used motor vehicles and infer quality|
|from pricing policies of sellers(Pindyck and Rubinfeld,1989). |
|Akerlof’s model is developed on the simplified basis that there are two types of used motor vehicles available, high quality or low |
|quality, with sellers knowing the quality, and buyers cannot distinguish the quality. A simplified numerical example explains the |
|results of quality differences: |
|We assume that the seller of a low quality motor vehicle will sell for $500, the seller of a high quality motor vehicle will sell for|
|$1200, and buyers will be willing to pay $700 for a low quality motor vehicle and $1500 for a high quality motor vehicle. Buyers will|
|have to estimate how much a motor vehicle is worth, and we assume the probability of obtaining a high or low quality motor vehicle is|
|equal. If a buyer will pay the expected value of a motor vehicle, then they would be willing to pay 0.5*700+0.5*1500=$1100. |
|The only seller willing to sell would be that of the low quality motor vehicles ($500

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