PT - JOURNAL ARTICLE ED - , TI - Editor's Letter AID - 10.3905/joi.2.1.4 DP - 1993 Feb 28 TA - The Journal of Investing PG - 4--4 VI - 2 IP - 1 4099 - https://pm-research.com/content/2/1/4.short 4100 - https://pm-research.com/content/2/1/4.full