Econometrica: Jan 2012, Volume 80, Issue 1

Stability and Preference Alignment in Matching and Coalition Formation

https://doi.org/10.3982/ECTA7143
p. 323-362

Marek Pycia

We study matching and coalition formation environments allowing complementarities and peer effects. Agents have preferences over coalitions, and these preferences vary with an underlying, and commonly known, state of nature. Assuming that there is substantial variability of preferences across states of nature, we show that there exists a core stable coalition structure in every state if and only if agents' preferences are pairwise‐aligned in every state. This implies that there is a stable coalition structure if agents' preferences are generated by Nash bargaining over coalitional outputs. We further show that all stability‐inducing rules for sharing outputs can be represented by a profile of agents' bargaining functions and that agents match assortatively with respect to these bargaining functions. This framework allows us to show how complementarities and peer effects overturn well known comparative statics of many‐to‐one matching.

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Supplemental Material

Supplement to "Stability and Preference Alignment in Matching and Coalition Formation"

This supplement (i) shows that a preference profile can be embedded in a rich domain of pairwise-aligned profiles if and only if it does not admit n-cycles, and (ii) discusses the trade-offs involved in relaxation of the assumptions in Theorems 1 and 2.

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