According to Sraffian economists, the determination of prices and distribution by taking sectoral outputs as given provides a logically coherent alternative to the neoclassical-type simultaneous determination of equilibrium prices and quantities. It is also maintained that both the aggregate and the general equilibrium versions of the neoclassical theory suffer from a logical inconsistence that prevents them from identifying a long-period position for the economy. Sraffa’s would therefore be the only consistent long-period theory.