This study explores a basic idea in political economy: Trading money for political influence. Our focus is at the level of international institutions, where governments may exploit their influence in one organization to gain leverage over another. In particular, we consider the lending...

Altruists and envious people who meet in contests are symbionts. They do better than a population of narrowly rational individuals. If there are only altruists and envious individuals, a particular mixture of altruists and envious individuals is evolutionarily stable.