Asymmetric information is an economic concept where one party in a transaction has more or better information than the other party.
This imbalance of knowledge can create market inefficiencies and lead to two main problems: adverse selection and moral hazard.
A. Adverse Selection
Adverse selection occurs before a transaction takes place. It happens when the party with better information uses that knowledge to their advantage, often leading the less-informed party to make a poor decision. This can cause a “market for lemons” where low-quality goods or high-risk individuals drive out the high-quality goods or low-risk individuals.
- Example: Used Car Market The seller of a used car knows its true condition (e.g., if it has engine problems or has been in an accident), while the buyer does not. The buyer, fearing they might purchase a “lemon” (a bad car), will be hesitant to pay a high price. This lowered price may cause sellers of high-quality cars to pull their vehicles from the market, as they feel the price isn’t fair. This leaves the market with a higher proportion of low-quality cars.
- Example: Health Insurance Individuals know more about their own health than an insurance company. People with chronic illnesses or high-risk lifestyles are more likely to seek out health insurance. If the insurance company can’t accurately assess individual risk, it may have to charge higher premiums for everyone to cover the cost of the “bad risks.” This, in turn, may make the insurance too expensive for healthy people, who then drop their coverage, leaving the insurance company with an even riskier pool of customers.
B. Moral Hazard
Moral hazard occurs after a transaction has taken place. It’s when one party changes their behavior because they no longer bear the full costs or risks of that behavior. This typically happens when they are protected by an insurance policy, a warranty, or another form of security.
- Example: Car Insurance After a driver buys car insurance, they might become less careful when parking their car or driving in traffic. They know that if their car gets damaged or they get into an accident, the insurance company will cover the repair costs. The driver’s behavior has become riskier because they are insulated from the full financial consequences of that risk.
- Example: Employee-Employer Relationship Once an employee is hired on a fixed salary, they might exert less effort or take more breaks than they did during the interview process. The employer cannot perfectly monitor all of their actions, and the employee is protected by their contract, so they don’t face the full cost of slacking off (e.g., a pay cut or being fired).
Solutions to Asymmetric Information
Markets have developed several ways to combat the problems caused by asymmetric information:
- Signaling: The informed party takes action to credibly reveal their private information. A car manufacturer offering a warranty on a new car signals that it’s a high-quality product. A college degree is a signal of a job candidate’s competence.
- Screening: The uninformed party takes action to gather information. A car buyer gets a used car inspected by a mechanic before purchasing it. An insurance company requires a medical exam for a new policyholder.
- Warranties and Guarantees: These provide assurance to buyers that a product is of good quality and that the seller will stand behind it.
- Reputation: A company’s brand name or reputation can serve as a signal of quality. Companies with a long-standing reputation for producing reliable goods are trusted by consumers, reducing the need for extensive screening.