Because there are no constants in the field of human action, the equation of mathematical catallactics [the analysis of actions which are conducted on the basis of monetary calculation] cannot be made to serve practical problems [in the social sciences] in the same way the equations of mechanics solve problems through the use of data and constants that have ascertained empirically [in the natural sciences].

Ludwig von Mieses, Notes and Recollections, p. 58 [my insertions]

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