PT - JOURNAL ARTICLE AU - Haim Levy TI - The CAPM and beta in an imperfect market AID - 10.3905/jpm.1980.408735 DP - 1980 Jan 31 TA - The Journal of Portfolio Management PG - 5--11 VI - 6 IP - 2 4099 - https://pm-research.com/content/6/2/5.short 4100 - https://pm-research.com/content/6/2/5.full