FEEM working papers "Note di lavoro" series
2005 .077

Cartel Stability under an Optimal Sharing Rule


Autori: Hans-Peter Weikard
Serie: Climate Change and Sustainable Development
Editor: Carlo Carraro
Tipo: Journal
Parole chiave: Cartel stability,Coalition formation games with spillovers,Partition function
Numero JEL: C72,D72,H41
JEL: The Manchester School
Pagine: Vol. 77, No. 5, pp. 575–593
Data: 09/2009

Abstract

Previous work on the formation and stability of cartels has focused on the case of identical players. This assumption is very restrictive in many economic environments. This paper analyses stability of cartels in games with heterogeneous players and spillovers to non-members. I introduce a sharing rule for coalition payoffs, called "optimal sharing" which stabilises all cartels that are possibly stable under any rule. Under optimal sharing the grand coalition is the unique stable cartel if spillovers are negative. I introduce a new property, called "non-essentiality" and determine the set of stable cartels under optimal sharing if spillovers are positive and if the non-essentiality property applies. Finally I analyse cartel stability under optimal sharing in simple public goods game with heterogeneous players. My results show - in contrast to earlier findings for identical players - that large coalitions may well be stable.

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