Definition:Adverse selection

⚠️ Adverse selection is the tendency for individuals or entities with higher-than-average risk to seek out and obtain insurance coverage more aggressively than their lower-risk counterparts. The phenomenon arises from information asymmetry: applicants generally know more about their own risk profile than the insurer does at the point of underwriting, and those who expect to file claims have a stronger economic incentive to buy coverage.

🔎 Left unchecked, adverse selection can set off a destructive cycle. As a risk pool skews toward higher-risk participants, loss ratios deteriorate, forcing the underwriter to raise premiums. Higher premiums then drive away the remaining lower-risk buyers, concentrating the pool further and pushing prices higher still — a dynamic sometimes called a death spiral. Insurers counteract this through detailed risk assessment, medical or behavioral underwriting, waiting periods, deductibles, and product design features that encourage broad participation.

🧩 Understanding adverse selection is essential for anyone involved in pricing, product design, or regulatory policy. Government-run programs such as the Affordable Care Act marketplaces tackle the problem with mandates and subsidies that bring healthier participants into the pool. In commercial markets, insurtech firms increasingly use predictive analytics and alternative data to close the information gap, improving selection accuracy while broadening access to coverage.

Related concepts

• Definition:Information asymmetry
• Definition:Moral hazard
• Definition:Risk pool
• Definition:Underwriting
• Definition:Risk selection
• Definition:Death spiral