The precise measurements of what determines social class in society has varied over time. Karl Marx thought "class" was defined by one's relationship to the means of production (their relations of production). His simple understanding of classes in modern capitalist society, are the proletariat, those who work but do not own the means of production; and the bourgeoisie, those who invest and live off of the surplus generated by the former. This contrasts with the view of the sociologist Max Weber, who argued "class" is determined by economic position, in contrast to "social status" or ""Stand"" which is determined by social prestige rather than simply just relations of production.