Market Segmentation and International Diversification Across Country and Industry Portfolios

We conjecture that partially segmented stock indexes that are characterized by low correlation with the world market are mainly priced by local factors and should produce abnormal returns relative to a global asset-pricing model. This implies a negative relation between correlation and future index returns in the presence of segmented indexes. Empirical evidence confirms such a relationship for the sample of industry indexes, suggesting a heterogeneous segmentation. Nonetheless, we do not observe a similar pattern for country indexes. Thus, cross-industry diversification is superior to cross-country diversification. The international diversification potential of industries does not vanish during volatile periods. Subsample analyses that are based on market size, development stage of markets, and an alternative segmentation measure reinforce our main findings