Wealth Effects on Demand for Insurance

34 Pages Posted: 28 Mar 2007

See all articles by Knut K. Aase

Knut K. Aase

Norwegian School of Economics (NHH) - Department of Business and Management Science

Date Written: February 13, 2007


A standard result states that under decreasing absolute risk aversion the indifference premium of the insured is a decreasing function of wealth. This has been interpreted to mean that insurance is an inferior good, which has been considered as a puzzle in insurance theory, in particular since the result does not seem to explain observed behavior in insurance markets.

We reformulate the standard model of risk sharing to incorporate the amount invested in the insurable asset. From this we identify two wealth effects, one direct and one indirect. The direct one is explained by the classical result, and is negative when risk aversion is decreasing. The indirect effect is positive when the insurable asset is a normal good, and we find conditions when insurance is a normal good, and when it is not.

The analysis is extended to Pareto optimal risk sharing, where we also analyze the joint problem of finding an optimal amount in the insurable asset, as well as a Pareto optimal insurance contract. In this latter case insurance turns out to be inelastic to changes in wealth of the insurance customer, provided the insurer's reserves are held fixed, but a normal good if this assumption is relaxed.

Keywords: The wealth effect in insurance, decreasing absolute risk aversion, inferior good, normal good, deductible, Pareto optimal risk exchange

Suggested Citation

Aase, Knut K., Wealth Effects on Demand for Insurance (February 13, 2007). NHH Dept. of Finance & Management Science Discussion Paper No. 2007/6. Available at SSRN: https://ssrn.com/abstract=971720 or http://dx.doi.org/10.2139/ssrn.971720

Knut K. Aase (Contact Author)

Norwegian School of Economics (NHH) - Department of Business and Management Science ( email )

Helleveien 30
Bergen, NO-5045

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