In co-operative games the players can communicate with each other and
collude. They can also enter into third-party enforceable binding contracts.
Much of this type of activity is expressly prohibited by law in developed
countries, so most of the games that are of interest in economic situations
are of the non-cooperative kind. This type of game involves forming selfenforcing
reliance relationships, which determine an equilibrium situation.
The nature of such equilibria is discussed in the next section.
b. Two-player and multi-player games