We calculate the equilibrium fraction of cooperators in a population in which payoffs accrue from playing a single-shot prisoner's dilemma game. Individuals who are hardwired as cooperators or defectors are randomly matched into pairs, and cooperators are able to perfectly find out the type of a...

Realizing the potential for economics research depends on the successful completion of several interdependent tasks: • A problem is identified, • Data related to the problem are collected, • Description transforms data into useful information, • Theory is brought to bear...