The Lens Condition with Two Factors

Abstract

We give a simple, constructive proof that the lens condition implies the factor-price equalization condition, when there are only two factors. Taking stock of the sufficient conditions under which the lens condition implies the FPE condition, we have the conditions of two factors or two goods or two countries or the condition that the rank of the factor-use matrix is equal to the number of goods. We show that in an essential sense, there are no other such conditions.Lens Condition, Factor Price Equalization