This is a dictionary entry forthcoming in Peter Newman, ed. The New Palgrave Dictionary of Economics and the Law, London: Macmillan, 1998.

We suggest an operational definition of transaction cost as the expected value of strategy information in games played by individuals randomly matched from a large population. We relate the concept of a transaction cost minimum to those of Nash equilibrium, efficiency, and evolutionary...

A large number of individuals are randomly matched into groups, where each group plays a finite symmetric game. Individuals breed true. The expected number of surviving offspring depends on own material payoff, but may also, due to cooperative breeding and/or reproductive competition, depend on...

In a laboratory experiment, we create relationships between pairs of anonymous subjects through a Prisoners' dilemma game. Thereafter the same subjects play a private values (sealed-bid double auction) bargaining game with or without communication. Communication substantially increases...

If contracting within the firm is incomplete, managers will expend resources on trying to appropriate a share of the surplus that is generated. We show that outside ownership may alleviate the deadweight losses associated with such costly distributional conflict, even if all it does is add...

A purchaser/provider split together with output- based reimbursement were recently introduced by several Swedish county councils. These changes have been motivated by arguments of efficiency and consumer choice. This paper tests the null hypothesis that hospital services are provided as...

A separation of provider and purchaser roles - together with performance-based reimbursement - were recently introduced in several county councils, which are the local governments that provide and fund almost all health care in Sweden. These changes have been motivated by efficiency and consumer...

We model networks of relational (or implicit)contracts, exploring how sanctioning power and equilibrium conditions change under different network configurations and information transmission technologies. In our model, relations are the links, and the value of the network lies in its ability to...