CAPM’s expected returns and delivered return on equity: an approach to the S&P500
This paper aims to reconcile two measures of return on shareholders’ capital: on one hand, the expected return arising from the use of the Capital Asset Pricing Model (CAPM), and on the other, the realized Return on Equity (ROE) as an accounting measure of capital efficiency. Both metrics ultimately refer to the same underlying variable—the cost of equity Ke—yet they are seldom analyzed jointly in the literature.