the case of both Newton's physics and the neoclassical theory, since the goal was to grasp the unchangeable and timeless essence of phenomena. For example, Newton created the concept of the material point by following the abstraction method so that he abstracted from the dimension and shape of any perceptible object, preserving only inertial and translational motion. Material point is the ultimate and common feature of all bodies. Neoclassical economists created the indefinitely abstract notion of homo economicus by following the same procedure. Economists abstract from all individual and personal qualities in order to get to those characteristics that embody the essence of economic activity. Eventually, it is the substance of the economic man that they try to grasp. Any characteristic beyond it only disturbs the functioning of this essential core. See also References Citations Sources Sohn-Rethel, Alfred (1977) Intellectual and manual labour: A critique of epistemology, Humanities Press. . Further reading . External links Internet Encyclopedia of Philosophy: Gottlob Frege Discussion at The Well concerning Abstraction hierarchy Concepts in epistemology Concepts in metaphilosophy Concepts in metaphysics Thought