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Almost all international environmental agreements include a minimum participation rule. Under such a rule an agreement becomes legally binding if and only if a certain threshold in terms of membership or contribution is reached. We analyze a cartel game with open membership and heterogeneous countries to study the endogenous choice of a minimum participation rule and its role for the success of international environmental agreements.

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Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. Terms of use: Documents in AbstractViewing individual contributions as investments in emission reduction we rely on the familiar linear public goods-game to set global reduction targets which, if missed, imply that all payoffs are destroyed with a certain probability. Regulation by milestones does not only impose a final reduction target but also intermediate ones. In our leading example the regulating agency is Mother Nature but our analysis can, of course, be applied to other regulating agencies as well. We are mainly testing for milestone effects by varying the size of milestones in addition to changing the marginal productivity of individual contributions and the probability to lose. Jena, Germany. Tel.: +49 3641 686684. E-mail address: koppel@econ.mpg.de * We are grateful to Christoph Engel, Gerhard Riener, M. Vittoria Levati, Michael Huettner, Oliver Kirchkamp and Sebastian Vergara, for valuable comments. We also would like to thank seminar audiences at the 2010 ESA world meeting in Copenhagen and the 2010 IAREP/SABE/ ICABEEP conference in Cologne for their feedback. We are indebted to Christian Streubel for programming assistance.