Political economy of international diversification: The case for partial integration

The literature on international portfolio diversification explored the benefits of international diversification and the pricing of securities in an international context largely from the perspective of an integrated world capital market. Imperfections in the international markets were acknowledged as exogenous variables added to the basically integrated market, and their effects on security prices, consequences of diversification, etc, were then measured. All studies are related, explicitly or implicitly to two extreme situations. One extreme situation is complete segmentation, the other is perfect market integration. This paper begins with a literature review to illustrate the inadequacy of either of the extreme situations described above. A case of partial integration where the barriers are an endogenous part of the model is then presented. Indirect and circumstantial evidence that the international financial markets are partially integrated by design, and not as a result of market failures, is then presented as a preliminary validation of the partial integration model.