Following the stormy discussions of the late fifties and early sixties, economic science formulated the principle of the dual nature of prices under socialism, specifically, that price is the monetary expression of value on the one hand, and that it is the planned cost norm on the other. The formula of the need to establish prices with regard to the law of value and the law of systematic development corresponds to this principle. It is also occasionally stated in the same vein that prices are in general determined by all the economic laws of socialism.