About twenty years ago I was on a panel at a science fiction convention. The title was "Economics, SF's Weak Spot: So many SF worlds, only two main economic systems. What else might we come up with as theories of value and exchange?" The two systems referred to were presumably capitalism and socialism but within those classifications there is quite a wide range of possibilities. The Yugoslav system, for example, while nominally socialist looked rather more like a market economy in which the firms were worker co-ops. The market socialism proposed by Abba Lerner and Oskar Lange in the course of the calculation controversy of the early 20th century was a system in which the means of production belonged to the state but the state instructed the managers to play the game of pretending to be profit maximizing capitalists in order to take advantage of the decentralized control mechanism of the market. The anarcho-capitalist system I sketched in my