Teaching trade patterns and trade gains under the Ricardian trade model is one of the most difficult tasks for teachers of international economics. We propose that the utilization of both the PPF and a labor market graph makes the understanding of Ricardian trade gains much easier

In the present note we construct an overlapping-generations (OLG) example in which free trade is Pareto-improving and the world equilibrium chaotic. The example is simple, but it is not incompatible with the general model of Kemp and Wolik