2. Another implication of the CAPM framework is that a security with a zero Beta should give a return exactly equal to the risk-free rate. Black,Jensen, and Scholes exhaustively studied security returns on the New York Stock Exchange over a 35-year period and found instead that the measured zero- Beta rate of return exceeded the risk-free rate. implying that some unsystematic (or non-Beta) risk makes the return higher for the zero.(1portfolio than is predicted by the CAPM. Moreover, the actual risk-return relationship examined by Black, Jensen, and Scholes appeared to be flatter than that predicted by the CAPM