Theorien über den Mehrwert
Henry of Ghent articulated the theory that every person has a property interest in their own body. John Locke uses the word property in both broad and narrow senses. In a broad sense, it covers a wide range of human interests and aspirations; more narrowly, it refers to material goods. He argues that property is a natural right and it is derived from labour. In addition, property precedes government and government cannot "dispose of the estates of the subjects arbitrarily." To deny valid property rights according to Locke is to deny human rights. The British philosopher had significant impacts upon the development of the Government of the UK and was central to the fundamental founding philosophy of the United States. Karl Marx later critiqued Locke's theory of property in his "Theories of Surplus Value", seeing the beginnings of a theory of surplus value in Locke's works. In Locke's "Second Treatise" he argued that the right to own private property was unlimited as long as nobody took more than they could use without allowing any of their property to go to waste and that there were enough common resources of comparable quality available for others to create their own property. Locke did believe that some would be more "industrious and rational" than others and would amass more property, but believed this would not cause shortages. Though this system could work before the introduction of money, Marx argued in "Theories of Surplus Value" that Locke's system would break down and claimed money was a contradiction of the law of nature on which private property was founded.