Demand heterogeneity in insurance markets: Implications for equity and efficiency

Area of Science:

• Health Economics
• Market Efficiency
• Insurance Markets

Background:

• Insurers are often legally restricted from price discrimination based on consumer attributes like age, gender, and medical history.
• Existing literature suggests these restrictions can lead to market inefficiencies when consumer willingness-to-pay for insurance varies.
• This inefficiency is particularly relevant in markets where consumers differ in their demand for insurance conditional on their risk exposure.

Purpose of the Study:

• To theoretically and empirically investigate the inefficiency of barring price discrimination in insurance markets.
• To demonstrate the empirical relevance of demand heterogeneity in health insurance markets.
• To analyze the trade-off between equity and efficiency in insurance markets with consumer selection.

Main Methods:

• Theoretical modeling of insurance markets with heterogeneous consumer willingness-to-pay.
• Empirical analysis using administrative claims data from consumer health plans.
• Examination of demand for health insurance conditional on objective medical spending risk across different demographic groups.

Main Results:

• Significant heterogeneity in health insurance demand was found across different age and gender groups, conditional on medical spending risk.
• Younger and older consumers, as well as men and women, exhibit distinct patterns in their demand for health insurance.
• These findings imply that uniform pricing across these groups leads to inefficient market outcomes.

Conclusions:

• Policies barring price discrimination based on consumer characteristics are inefficient in health insurance markets.
• Empirical evidence supports the existence of demand heterogeneity linked to demographics and risk.
• Efficient sorting of consumers across insurance contracts requires differentiated pricing, highlighting a unique equity-efficiency trade-off in selection markets.