"The aim of justice is, as the Romans used to say, to give each his due, and in order for each to be given what is his, it is necessary that it already belong to him; to "give", in this sense, means to protect the right of possession. Each man gets "what belongs to him" in the course of voluntary exchanges that constitute the economic process, and, by virtue of the operation of the market, each receives for his contribution, precisely the amount that will impel him to increase the supply of the most urgently demanded commodities… Only when each man thereby gets what belongs to him, and someone wants to take it away from him, does a question of justice arise."