Ítem
Acceso Abierto

Heterogeneity and the formation of risk - sharing coalitions

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Autores
Jaramillo Mejía, Fernando
Kempf, Hubert
Moizeau, Fabien

Fecha
2013

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Editor
Universidad del Rosario

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Resumen
Abstract
We offer a new explanation of partial risk sharing based on coalition formation and segmentation of society in a risky environment, without assuming limited commitment and imperfect information. Heterogenous individuals in a society freely choose with whom they will share risk. A partition belonging to the core of the membership game obtains. Perfect risk sharing does not necessarily arise. Focusing on mutual insurance rule and assuming that individuals only differ with respect to risk, we show that the core partition is homophily-based. The distribution of risk affects the number and size of these coalitions. Individuals may pay a lower risk premium in riskier societies. A higher heterogeneity in risk leads to a lower degree of risk sharing. We discuss how the endogenous partition of society into risk-sharing coalitions may shed light on empirical evidence on partial risk sharing. The case of heterogenous risk aversion leads to similar results.
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Keywords
Risk Sharing , Group Membership , Social Segmentation
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