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Sticks and carrots for the design of international climate agreements with renegotiations. (English) Zbl 1301.91038

Summary: This paper examines renegotiations of international climate agreements for carbon abatement. We explore coalition stability under ‘optimal transfers’ that have been suggested to stabilise international environmental agreements (e.g. [M. McGinty, “International environmental agreements among asymmetric nations”, Oxf. Econ. Pap. 59, No. 1, 45–62 (2007; doi:10.1093/oep/gpl028)]). Such transfer schemes need to be refined when agreements are renegotiated. We determine the requirements that transfers between signatories of an international climate agreement must satisfy in order to stabilise the sequence of agreements that performs best in terms of provision of the public good ‘carbon abatement’. If these requirements are met, no country wants to change its membership status at any stage. In order to demonstrate the applicability of our result we use the STACO model, a 12-regions global model, to assess the impact of well-designed transfer rules on the stability of an international climate agreement. Although there are strong free-rider incentives, we find a stable grand coalition in the first commitment period in a game with one round of renegotiations if renegotations take place sufficiently early.

MSC:

91B76 Environmental economics (natural resource models, harvesting, pollution, etc.)
91B74 Economic models of real-world systems (e.g., electricity markets, etc.)
91A40 Other game-theoretic models
91B32 Resource and cost allocation (including fair division, apportionment, etc.)

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