Quotes from book
A Theory of Socialism and Capitalism

“Essentially, economic analysis consists of: (1) an understanding of the categories of action and an understanding of the meaning of a change in values, costs, technological knowledge, etc.; (2) a description of a situation in which these categories assume concrete meaning, where definite people are identified as actors with definite objects specified as their means of action, with definite goals identified as values and definite things specified as costs; and (3) a deduction of the consequences that result from the performance of some specified action in this situation, or of the consequences that result for an actor if this situation is changed in a specified way. And this deduction must yield a priori-valid conclusions, provided there is no flaw in the very process of deduction and the situation and the change introduced into it being given, and a priori—valid conclusions about reality if the situation and situation—change, as described, can themselves be identified as real, because then their validity would ultimately go back to the indisputable validity of the categories of action.”

Hans-Hermann Hoppe book A Theory of Socialism and Capitalism

A Theory of Socialism and Capitalism: Economics, Politics, and Ethics (Kluwer: 1989): 118-19.
A Theory of Socialism and Capitalism (1989)