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In generic terms, the concept of insurance may be defined as the transfer of risk from one party to another through a legal contract. The insurer assumes the risk in exchange for the payment of premiums. Insurance spreads one person's risk of loss among a large number of individuals through the pooling of premiums. When the transfer of risk is accomplished by purchasing an insurance policy, the policyowner obtains a large quantity of coverage in return for a small fee (premium).
Risk pooling (also referred to as loss sharing) is a fundamental insurance concept that distributes risk by spreading the cost of possible losses over a large number of similar (homogeneous) exposure units. For effective risk pooling, insurance companies must:
When you purchase an insurance policy, you're joining a pool of similar risks. You pay a premium that's much smaller than the potential loss you're insuring against. The insurance company combines these premiums from many policyholders to create a fund for paying claims. This arrangement benefits both parties:
For example, a life insurance company pools the mortality risk of 10,000 people who are of similar age, health status, and risk classification. By grouping similar risks together, the company can more accurately estimate the overall expected losses for the group, even though it cannot predict which specific individuals will incur a loss.
Risk pooling transfers risk from an individual to a group.
Adverse selection is broadly defined as selection against the insurance company. It occurs when higher-risk individuals are more likely to seek or maintain insurance coverage than lower-risk individuals. This often happens when applicants have more accurate information about their own risks than the insurance company does. To combat adverse selection and remain profitable, insurance companies use underwriting to properly evaluate risks and set appropriate premiums. A successful insurance operation maintains a balanced distribution of risks, with some preferred risks (lower than average), some average risks, and a limited number of higher-risk individuals. Companies use several tools to minimize adverse selection, including thorough underwriting practices, charging higher premiums for higher-risk individuals, and offering group insurance coverage where the law of large numbers helps balance the risk pool.
Examples of adverse selection in life and health insurance:
To protect against adverse selection, insurance companies use several methods:
| Category | Warning Sign | Example | Prevention Method |
|---|---|---|---|
| Application process | Unusual urgency, incomplete information, large amounts | Rush to get coverage before a medical procedure | Thorough underwriting practices |
| Claims history | Early claims, pattern of claims | Major claim right after policy becomes effective | Waiting periods, preexisting conditions clause |
| Risk profile | Above average, concealed information | Much higher coverage than financial need | Risk classification, medical exams, financial verification |
Adverse selection increases the insurance company's risk and results in higher claims costs than the company anticipated. Insurance companies use underwriting to help prevent adverse selection. Concealing material information on an insurance application is a form of adverse selection.