PT - JOURNAL ARTICLE AU - Peter L. Bernstein TI - How bad were the good old days? AID - 10.3905/jpm.1990.409258 DP - 1990 Jan 31 TA - The Journal of Portfolio Management PG - 1--2 VI - 16 IP - 2 4099 - https://pm-research.com/content/16/2/1.short 4100 - https://pm-research.com/content/16/2/1.full