One of the most original and most important ideas advanced by Hayek is the role of the "division of knowledge" in economic society … [But if] I had to single out the area in which Hayek's contributions were the most fundamental and pathbreaking, I would cast my vote for the theory of capital. As I said before, when I reviewed Hayek's book on The Pure Theory of Capital, it is "my sincere conviction that this work contains some of the most penetrating thoughts on the subject that have ever been published." If two achievements may be named, I would add Hayek's contributions to the theory of economic planning. Most of what has been written on systems analysis, computerized data processing, simulation of market processes, and other techniques of decision-making without the aid of competitive markets, appears shallow and superficial in the light of Hayek's analysis of the 'division of knowledge', its dispersion among masses of people. Information in the minds of millions of people is not available to any central body or any group of decision-makers who have to determine prices, employment, production, and investment but do not have the signals provided by a competitive market mechanism. Most plans for economic reform in the socialist countries seem to be coming closer to the realization that increasing decentralization of decision-making is needed to solve the problems of rational economic planning.