Errunza and Senbet [ES, 7] analyze the effects of international operations on the market value of the both at theoretical and empirical levels. The theoretical model, which is largely heuristic, exploits the costly supply adjustment of multinational firms (MNCs) in providing international portfolio diversification services to investors who face differential cost barriers to direct holdings of assets across national boundaries. MNCs compete as financial intermediaries to undo the barriers so that, in equilibrium, profits are driven out; MNCs and pure domestic firms sell at an equivalent risk-adjusted return. However, costly financial intermediation and the associated relative efficiency leads to a positive valuation effect for MNCs relative to purely domestic firms. Further, the equilibrium analysis implies that demand-side (investor) barriers to international capital flows alone are inconsequential to the valuation of MNCs in their pure financial role, but that the interaction with the supply-side costs are necessary to produce a valuation effect at the corporate level. ES subject the theory to an empirical analysis in a value-based approach by employing a variant of Tobin's [17] qratio. The analysis, controlling for industrial market power, suggests that the relationship between the excess valuation and the degree of international involvement (DOI) has magnified over periods characterized by severe U.S. government controls vis-a-vis the more recent periods. In this paper we formalize the theoretical argument by viewing indirect portfolio diversification by MNCs as a means of completing the international capital market. We employ a paradigm in the unanimity literature and formally characterize the equilibrium in which there is a rationale for MNC financial intermediation. We then perform an expanded empirical study by employing generalized least squares and maximum likelihood procedures. Since the positive relationship between excess valuation and DOI (as suggested in ES [7]) might be attributed to the so-called small firm or size and the P/E effects, the test methodology controls for such effects. Also, the traditional literature has relied upon foreign sales percentage as a proxy for DOI. In view of the well recognized limitations of this proxy, we employ four different measures of international
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