Symmetric versus asymmetric conditional covariance forecasts: Does it pay to switch?
- Publisher:
- Blackwell Publishing
- Publication Type:
- Journal Article
- Citation:
- Journal of Financial Research, 2007, 30 (3), pp. 355 - 377
- Issue Date:
- 2007-01
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Volatilities and correlations for equity markets rise more after negative returns shocks than after positive shocks. Allowing for these asymmetries in covariance forecasts decreases mean-variance portfolio risk and improves investor welfare. We compute optimal weights for international equity portfolios using predictions from asymmetric covariance forecasting models and a spectrum of expected returns. Investorswho are moderately risk averse, have longer rebalancing horizons, and hold U.S. equities benefit most and may be willing to pay around 100 basis points annually to switch from symmetric to asymmetric forecasts. Accounting for asymmetry in both variances and correlations significantly lowers realized portfolio risk.
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