What is the role of information asymmetry in market failure?

• A. It ensures perfect information for both sides.
• B. It can lead to adverse selection and moral hazard.
• C. It reduces transaction costs and improves matching.
• D. It eliminates all inefficiencies.

Answer: (B)

Information asymmetry happens when one side of a transaction has more or better information than the other. This gap distorts decisions, leading to market failure because prices and quantities no longer reflect true values.

The best choice captures two classic problems that arise from this imbalance: adverse selection and moral hazard. Adverse selection occurs before the deal is made: those most likely to have high risk or low quality are the ones most motivated to reveal their characteristics, while the other party can’t distinguish quality, drawing the market toward the less desirable side. In insurance or used markets, this can drive up costs or push out good-quality participants, creating a lemon problem. Moral hazard happens after the contract is in place: once one party faces fewer consequences for risky behavior, they may act more irresponsibly or shirk effort, which undermines the contract’s value and reduces overall welfare.

These dynamics show why information asymmetry leads to inefficiencies, not the opposite. It does not create perfect information, it tends to raise costs and misprice goods or risks, and it does not eliminate inefficiencies.