ABSTRACT
Human beings project different possibilities of action into the future and they evaluate them. Whether in the market or in a social interaction, every person acts in accordance with some moral norms, whose study establishes the importance of the evaluative system in the theory of action. This chapter sets out the contributions of Israel Kirzner, Murray Rothbard and Hans-Hermann Hoppe. Essentially, these three authors present the same criticism of Ludwig Von Mises. They criticize him because, in spite of the brilliance of his contribution to the defence of the market economy and private property, his arguments are centred on the acceptance of capitalism because of its monetary consequences. The chapter offers some new praxeological developments which enable them to mount a more effective defence of the market economy than that offered by Mises. In a common world, man realizes that another person makes the thing that he desires available and that he has something to offer in exchange for it.
