For finite games in strategic form it is shown that, in a Nash equlibrium, every player uses a strategy which is computable. However, there can exist no algorithm which is guaranteed to find an equilibrium for every instance of a game with computable payoffs. In contrast, an e-equilibrium is...

This paper considers four examples of apparent progress in economics, each of which proved illusory. In each case the problem stemmed from factual errors. The cases relate to the treatment by Arrow of the incentives to finance basic research, the obliteration of industrial economics by game...