This paper reports data from an ultimatum mini-game in which responders first had to choose whether or not to participate. Participation was costly, but the participation cost was smaller than the minimum payoff that a responder could guarantee himself in the ultimatum game. Compared to a...

Two parties can at some future date 2 negotiate about whether or not to collaborate in order to generate a surplus. Yet, the negotiation stage will be reached only if at date 1 both parties pay their respective transaction costs. We show that the expected total surplus may be larger when at date...