 On the contrary, when one concept of "homo economicus" claims to grasp the eternal essence of what is human, at the same time putting aside all other aspects of human nature (such as "homo faber", "homo loquens", "homo ludens", "homo reciprocans", and so on), then the concept leaves the field of good philosophy, not to speak of social science, and is ready to enter a political doctrine as the most dangerous of its ideological ingredients.Comparisons between economics and sociology have resulted in a corresponding term "homo sociologicus" (introduced by German sociologist Ralf Dahrendorf in 1958), to parody the image of human nature given in some sociological models that attempt to limit the social forces that determine individual tastes and social values.