Which of the following is the best measure of market risk premium in equity valuation? Geometric average market return over last 50 years - yield of the 10-year T-Bond Arithmetic average market return over last 10 years - yield of the 1-year T-Bill Geometric average market return over last 10 years - yield of the 10-year T-Bond Arithmetic average market return over last 50 years - yield of the 1-year T-Bill