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Optimal Insurance for a Minimal Expected Retention: The Case of an Ambiguity-Seeking Insurer
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Optimal Insurance for a Minimal Expected Retention: The Case of an Ambiguity-Seeking Insurer

Massimiliano Amarante and Mario Ghossoub
Risks (Basel), Vol.4(1), pp.1-27
03/01/2016
DOI: 10.3390/risks4010008
url
https://doi.org/10.3390/risks4010008View
Published (Version of record) Open Access

Abstract

In the classical expected utility framework, a problem of optimal insurance design with a premium constraint is equivalent to a problem of optimal insurance design with a minimum expected retention constraint. When the insurer has ambiguous beliefs represented by a non-additive probability measure, as in Schmeidler, this equivalence no longer holds. Recently, Amarante, Ghossoub and Phelps examined the problem of optimal insurance design with a premium constraint when the insurer has ambiguous beliefs. In particular, they showed that when the insurer is ambiguity-seeking, with a concave distortion of the insured's probability measure, then the optimal indemnity schedule is a state-contingent deductible schedule, in which the deductible depends on the state of the world only through the insurer's distortion function. In this paper, we examine the problem of optimal insurance design with a minimum expected retention constraint, in the case where the insurer is ambiguity-seeking. We obtain the aforementioned result of Amarante, Ghossoub and Phelps and the classical result of Arrow as special cases.
Business & Economics Business, Finance Social Sciences

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