PT - JOURNAL ARTICLE AU - Peter L. Bernstein TI - What this issue is all about AID - 10.3905/jpm.1979.408722 DP - 1979 Oct 31 TA - The Journal of Portfolio Management PG - 4--4 VI - 6 IP - 1 4099 - https://pm-research.com/content/6/1/4.short 4100 - https://pm-research.com/content/6/1/4.full