“The light which the economic theorist can throw on an economic process, or on the outcome of such a process, is viewed as deriving from his ability to relate back the process to the individual acts of choice of which the process is made up. Through the theorist’s understanding of the decisions made by individuals, and of the way in which these decisions have mutual impact upon one another, and become mutually adjusted to one another, he is able to ‘explain’ the course of economic events, and to understand the probable results that will follow from given exogenous changes operating on the system.” (Emphasis added.)

Israel M. Kirzner, An Essay on Capital, 1966