# New methods in the classical economics of uncertainty: comparing risks

## Author

Listed:
• Christian Gollier

() (Toulouse School of Economics)

• Miles S. Kimball

## Abstract

Abstract Second-order stochastic dominance answers the question “Under what conditions will all risk-averse agents prefer $$\tilde{x}_2$$ x ~ 2 to $$\tilde{x}_1$$ x ~ 1 ?” Consider the following related question: “Under what conditions will all risk-averse agents who prefer lottery $$\tilde{x}_1$$ x ~ 1 to a reference lottery $$\tilde{\omega }$$ ω ~ also prefer lottery $$\tilde{x}_2$$ x ~ 2 to that reference lottery?” Each of these two questions is an example of a broad category of questions of great relevance for the economics of risk. The second question is an example of a contingent risk comparison, while the question behind second-order stochastic dominance is an example of a non-contingent risk comparison. The stochastic order arising from a contingent risk comparison is obviously weaker than that arising from the corresponding non-contingent risk comparison, but we show that the two stochastic orders are closely related, so that the answer to a non-contingent risk comparison problem always provides the answer to the corresponding contingent risk comparison problem. In addition to showing the connection between parallel contingent and non-contingent risk comparison problems, we articulate a method for solving both kinds of problems using the “basis” approach. The basis approach has often been used implicitly, but we argue that there is value in making its use explicit, particularly in indicating which new, previously unsolved problems can readily be solved by the basis approach and which cannot.

## Suggested Citation

• Christian Gollier & Miles S. Kimball, 2018. "New methods in the classical economics of uncertainty: comparing risks," The Geneva Papers on Risk and Insurance Theory, Springer;International Association for the Study of Insurance Economics (The Geneva Association), vol. 43(1), pages 5-23, May.
• Handle: RePEc:kap:geneva:v:43:y:2018:i:1:d:10.1057_s10713-018-0026-y
DOI: 10.1057/s10713-018-0026-y
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## References listed on IDEAS

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Full references (including those not matched with items on IDEAS)

## Citations

Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
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Cited by:

1. Burton Hollifield & Alan Kraus, 2009. "Defining Bad News: Changes in Return Distributions That Decrease Risky Asset Demand," Management Science, INFORMS, vol. 55(7), pages 1227-1236, July.
2. Jordi Caballe & Joan Esteban, 2007. "Stochastic Dominance and Absolute Risk Aversion," Social Choice and Welfare, Springer;The Society for Social Choice and Welfare, vol. 28(1), pages 89-110, January.
3. Gollier, Christian, 1996. "Deductible insurance and production: A comment," Insurance: Mathematics and Economics, Elsevier, vol. 19(1), pages 55-59, December.
4. Gollier, Christian & Schlesinger, Harris, 2002. "Changes in risk and asset prices," Journal of Monetary Economics, Elsevier, vol. 49(4), pages 747-760, May.
5. Jouini, Elyès & Marin, Jean-Michel & Napp, Clotilde, 2010. "Discounting and divergence of opinion," Journal of Economic Theory, Elsevier, vol. 145(2), pages 830-859, March.

### Keywords

Stochastic dominance; Central riskiness; Comparative statics under uncertainty; Increase in risk;

### JEL classification:

• D81 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Criteria for Decision-Making under Risk and Uncertainty

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