A study on equity home bias using vine copula approach

The study investigates if the mean-downside risk optimization technique for asset allocation can shed new light on the equity home bias puzzle. We propose a combined EGARCH-EVT-C-vine copula approach to properly capture the stylized properties of asset return series and estimate the downside risk appropriately by CVaR. Using weekly stock price data from 12 countries including seven G7 countries and five BRICS countries, we estimate international portfolio allocations based on mean-CVaR optimization model and compare the results to the mean–variance allocations. The study has been done from the perspective of US investors. The results of the study suggest that the US equity home bias is overestimated by the mean–variance approach. The mean-CVaR model helps to factor in the additional risk that investors face in international portfolio diversification and provides a plausible empirical explanation for the equity home bias phenomenon. The findings of the study have direct implications for portfolio managers and investors for taking better international investment decisions based on the knowledge of optimum portfolio.