Vanguard has been incubating a sustainable portfolio, consisting entirely of U.S. common stocks and wishes to evaluate it using both the Treynor and Sharpe measures of portfolio performance. The following table provides the average annual rate of return for the sustainable portfolio, the market portfolio (as measured by the S&P 500 index mutual fund), and U.S. Treasury bills during the past two years. The Sharpe and Treynor measures for Sustainable portfolio are and respectively. Sustainable portfolio S&P 500 index mutual fund one-year Treasury bills Average annual rate of return (%) 15.88 9.78 6.00 Standard deviation of return (%) 15.29 13.15 Beta 1.62 1.00