In their majority, public international lawyers postulate that for a new rule of customary law to originate, two conditions must be fulfilled: there must be consistent practice, and it must be shown that this practice is motivated by the belief that such behaviour is required in law. Maurice...

We introduce a generalization of the Beauty Contest (BC) game as a framework that incorporates different models from micro- and macroeconomics by formulating their reduced forms as special cases of the BC. Examples include public good games, ultimatum games, Bertrand, Cournot, some auctions,...

We analyze an experimental public goods game in which group members can endogenously determine whether they want to supplement a standard voluntary contribution mechanism with the possibility of rewarding or punishing other group members. We find a large and positive effect of endogenous...