ideal+reality
131Law of value — The law of value is a concept in Karl Marx s critique of political economy. Most generally, it refers to a regulative principle of the economic exchange of the products of human work: the relative exchange values of those products in trade,… …
132physical science, principles of — Introduction the procedures and concepts employed by those who study the inorganic world. physical science, like all the natural sciences, is concerned with describing and relating to one another those experiences of the surrounding… …
