 This work became a foundation stone of the "value-form" approach to Marxist theory, exemplified by Hans-Georg Backhaus, Chris Arthur, Geert Reuten, and the "Konstanz–Sydney" group (Michael Eldred, Mike Roth, Lucia Kleiber, and Volkbert Roth).In this interpretation of Marx, "it is the development of the forms of exchange that is seen as the prime determinant of the capitalist economy rather than the content regulated by it".Capitalism is here understood as a method of regulating human labor by giving it the social form of an exchangeable commodity (the "value-form"), rather than a disguised or mystified system that is otherwise similar in content to other class-based societies.