Coalition Formation in a Global Warming Game: How the Design of Protocols Affects the Success of Environmental Treaty-Making
CORE Discussion Paper No. 2003/88
34 Pages Posted: 23 Apr 2007
Date Written: December 2003
Abstract
We combine the newest concepts o non-cooperative coalition theory with a computable general equilibrium model close to the seminal RICE-model of Nordhaus and Yang (1996) to determine stable coalition structures in a global warming game. We consider three coalition games that allow for the formation of multiple coalitions. The coalition games represent different designs of climate treaty protocols. Counterintuitively, it turns out that treaties based on a unanimous decision rule and exclusive membership lead to superior outcomes than treaties with open membership. We also demonstrate that if coalition formation is not restricted to a single coalition, as this has been done previously in the literature, coalition structures with multiple coalitions will emerge in equilibrium. Most of the regional agreements are superior to single agreements. Moreover, our findings confirmthose derived fromsim pler theoretical models that a cleverly designed transfer scheme can foster cooperation and that fromthe number of participants the success of a treaty cannot be inferred. They also support a conjecture of theory that in the case of greenhouse gases stable coalition structures (partial cooperation) can close the gap between the global optimum (full cooperation) and the Nash equilibrium(no cooperation) by a substantial amount
Keywords: design of climate treaty protocol, coalition formation, non-cooperative game theory
JEL Classification: C68, C72, H41, Q25
Suggested Citation: Suggested Citation
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