We argue that small group competition among overlapping oligopolies is the predominate market form in modern society applicable whenever goods are located by their address in some relevant space: characteristic space for monopolistic competition and geographic space for spatial competition....

We argue that socializing is an important economic activity because it is vital to our well being, and that an important input into the activity of socializing is the set of experiences that is shared by the participants.

We study different methods of immigration control using a simple model of a congested world. Our main comparison involves quota, the predominant instrument of immigration control, and a proposed system of immigration tolls and emigration subsidies. We show that the equilibrium of the proposed...

We consider a world in which the mode of food production, foraging or agriculture, is endogenous, and in which technology grows exogenously. Using a recent model of coalition formation, we allow individuals to rationally form cooperative communities (bands) of foragers or farmers. At the lowest...