A Theory of Full Employment has three purposes. First, to convince professional economists who study the behaviour of the economic system as a whole that they must re-examine some of the assumptions behind the reigning economic theories. Second, to explain to the general public why the currently fashionable economic policies cannot solve the problem of massive long term unemployment. Third, to show that if people's political engagement is revived there is hope for escaping from the economic morass and moral wasteland into which, ever since the 1970s, the fashionable policies have been leading us.