The criterion of truth is that it works even if nobody is prepared to acknowledge it.
Ludwig von MisesYou know that the population is of this planet is now ten times greater than it was in the ages preceding capitalism.; you know that all men today enjoy a higher standard of living than your ancestors did before the age of capitalism. But how do you know that you are the one out of ten who would have lived in the absence of capitalism? The mere fact that you are living today is proof that capitalism has succeeded, whether or not you consider your own life very valuable.
Ludwig von MisesAll varieties of interference with the market phenomena not only fail to achieve the ends aimed at by their authors and supporters, but bring about a state of affairs which - from the point of view of their authors and advocates valuations - is less desirable than the previous state of affairs which they were designed to alter.
Ludwig von Mises