My whole concept of economics is based on the idea that we have to explain how prices operate as signals, telling people what they ought to do in par… - Friedrich Hayek

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My whole concept of economics is based on the idea that we have to explain how prices operate as signals, telling people what they ought to do in particular circumstances. The approach to this problem has been blocked by a cost or labor theory of value, which assumes that prices are determined by the technical conditions of production only. The important question is to explain how the interaction of a great number of people, each possessing only limited knowledge, will bring about an order that could only be achieved by deliberate direction taken by somebody who has the combined knowledge of all these individuals. However, central planning cannot take direct account of particular circumstances of time and place. Additionally, every individual has important bits of information which cannot possibly be conveyed to a central authority in statistical form. In a system in which the knowledge of relevant data is dispersed among millions of agents, prices can act to coordinate the separate actions of different individuals.
Given this context, it is intellectually not satisfactory to attempt to establish causal relations between aggregates or averages in the manner in which the discipline of macroeconomics has attempted to do. Individuals do not make decisions on the basis of partial knowledge of magnitudes such as the total amount of production, or the total quantity of money. Aggregative theorizing leads nowhere.