The CAPM estimate of rs is equal to the risk-free rate, rRF, plus a risk premium that is equal to the risk premium on an average stock, (rM - rRF), scaled up or down to reflect the particular stock's risk as measured by its beta coefficient, bi. This model assumes that a firm's stockholders are ______________ diversified, but if they are ______________ diversified, then the firm's true investment risk would not be measured by _______________- and the CAPM estimate would _______________ the correct value of rs.