Countertrade agreements in international trade refer to a practice in which an exporter agrees to purchase in the future, from the importer, commodities proportional to his original export sale. The paper analyzes why it might be efficient for agents to undertake trade through a reciprocal...

We study how norms can solve distributional conflict inside a clan and the efficient coordination of collective action in a conflict with an external enemy. We characterize a fully non-cooperative equilibrium in a finite game in which a self-enforcing norm coordinates the members on efficient...