 The distinction between the two different types of goods was a clearer formulation of Marx’s ideas in "Das Kapital", and also helped people to better understand the extent of the trade off between the levels of immediate and future consumption.These ideas were however first introduced in 1928 by Feldman, an economist working for the GOSPLAN planning commission; presenting theoretical arguments of a two-department scheme of growth.There is no evidence that Mahalanobis knew of Feldman’s approach, being kept behind the borders of the USSR.