A portfolio manager gathers monthly stock returns going back to the year 1901 and estimates mean returns,

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A portfolio manager gathers monthly stock returns going back to the year 1901 and estimates mean returns, variances, and cross-market correlations for 50 countries. She identifies the efficient frontier and then invests in the portfolio that is mean-variance efficient relative to the U.S. risk-free rate. Is this fund manager’s performance over the coming year likely to be similar to the historical record? Over the next 5 years? Over the next 10 years? Explain.

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