We study the repeated prisoner's dilemma with random matching, a canonical model of
community enforcement with decentralized information. We assume that (1) with small …

We study anonymous repeated games where players may be “commitment types” who
always take the same action. We establish a stark anti-folk theorem: if the distribution of the …

I survey models of cooperation in large populations. Topics include repeated games with
public monitoring, random matching games, games on networks, infinitepopulation games …

People are embedded in multiple social relations. These relations are not isolated from each
other. Do different networks overlap and why? We focus on the following question: When an …

We propose a game theoretic model for multiplexity in signed networks through strategic
interactions amongst n players who are linked to each other in an existing (fixed) signed …

This article develops a model to explore how favour exchange influences wealth dynamics.
We identify a key obstacle to wealth accumulation: wealth crowds out favour exchange …

I introduce a favor exchange model where favors are substitutable and study bilateral
enforcement of cooperation. Without substitutability, the value of a relationship does not …

We investigate the competitive effects of spot-price contracting, in which a buyer and seller
contract to transact at a future date at the price prevailing in that market at that future date …

Does market exchange reduce participation in non-market exchange thus reducing overall
welfare? Some have argued that markets strengthen the necessary conditions for a vibrant …

I introduce a favor exchange model that allows players to rely on multiple partners to obtain
favors (ie, cooperation is substitutable) and study bilateral enforcement of cooperation …