Given an economy in which there is a commodity trading between two Sectors A and B. For a given vector of prices Sector B is interested in getting a maximal commodity worth under an expenditure constraint. Sector A is interested in finding a feasible vector of prices such that the level of trade allowance per one unit of commodity worth is maximized. The problem under consideration is a quasiconvex minimization. Using quasiconvex duality we obtain a dual problem and a generalized Karush-Kuhn-Tucker condition for optimality. The optimal vector of prices can be interpreted as equilibrium and as a linearization of the commodity worth function at the optimal dual’s solution.