Institutions are strikingly absent from most economic theory, certainly from growth theory.In standard theory it is simply assumed that the needed institutional environment is there,within which economic agents can make their optimizing decisions. At the same time, indescriptive growth studies,...

This paper shows that donors that maximize relative aid impact spread their budgets across many recipient countries in a unique Nash equilibrium, explaining aid fragmentation. This equilibrium may be inefficient even without fixed costs, and the inefficiency increases in the equality of donors'...