The current debate in Western Europe centers on the relationship between economic and political integration. To address this problem, we construct a simple general equilibrium model in which the returns to trading are directly affected by the availability of a public good. In our model,...

I present a model of the creative development of a field and analysis of the model based on an extensive set of simulations. The field begins from an initial states and grows as individuals enter the field and make new contributions; its basic structure resembles a lattice. New elements are...