Description: The Society of Actuaries’ Pension Section Research Committee commissioned this study to help actuaries develop forward thinking long-term estimates of future equity risk premiums. Equity risk premium is the amount by which the total return of a stock market index, such as the S&P 500, exceeds that of government bonds. Equity risk premiums, calculated from historical data, have been used to project long term values of equity portfolios in retirement plans. The validity of using historical data to project future equity returns will be examined along with other forward looking methods.