Is the Leontief model a production-prices model?

The Leontief model is generally considered as belonging to the category of the production-prices models , aside of the Ricardian, Marxian and Sra aian models. This paper clearly demonstrates that this is a super cial point of view. As the Leontief model handles price indexes, it is biperiodic: the Leontief price indexes solve the model for the base time period. The production-prices model that corresponds to it is monoperiodic: the current prices solve the production-prices model for the current time period. Both models diverge generally unless a very strong assumption is done: the interindustry matrix of direct and indirect quantities of labor incorporated per unit of physical output is stable over time, that is, the interindustry matrix of Marxian values; this implies that the vertically integrated coe cients of labor are stable. This assumption is satis ed when the production coe cients in physical terms and the physical coe cients of labor are stable over time, two very strong assumptions. We conclude that the Leontief model is generally not a production-prices model, unless quite Classical-Marxian assumptions are done. JEL classi cation. E11, B51, D57, C67.