Endogenous asymmetric information and international equity home bias: The effects of portfolio size and information costs

Equity home bias is one of the major puzzles in international finance. This paper investigates the impact of asymmetric information on equity home bias in a rational expectation model where portfolio managers differ in their levels of initial portfolio size and information acquisition is endogenous. The model characterizes the information acquisition and investment decisions made by each portfolio manager, and the resulting equilibrium. We find that portfolio managers with larger portfolio size acquire information about the foreign asset; this is consistent with new evidence linking the degree of home bias across portfolio managers to portfolio size.