ABSTRACT
Throughout the history of the MPTD, the most recurring and disputed theme has probably been the causality of the marginal product, i.e. the question of whether the marginal product is a monocausal or a multicausal phenomenon. It is universally acknowledged that the total product is the result of the actions of many factors or causes, but it has been either asserted or implied by some contributors, and denied by others, that the marginal product can be causally attributed to the marginal unit of the factor, and that if more than one factor is involved in the production of the marginal product, their particular contributions can be disentangled.
