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No laboratory experiments can be performed with regard to human action. We are never in a position to observe the change in one element only, all other conditions of the event remaining unchanged. Historical experience as an experience of complex phenomena does not provide us with facts in the sense in which the natural sciences employ this term to signify isolated events tested in experiments. The information conveyed by historical experience cannot be used as building material for the construction of theories and the prediction of future events. Every historical experience is open to various interpretations, and is in fact interpreted in different ways. History speaks only to those people who know how to interpret it on the ground of correct theories.

Ludwig von Mises
Ludwig von Mises

Ludwig von Mises (1881-1973) taught in Vienna and New York and served as a closes adviser to the Foundation for Economic Education. He is considered the leading theorist of the Austrian School of the 20th century.