PT - JOURNAL ARTICLE AU - Gew-rae Kim AU - Harry M. Markowitz TI - Investment rules, margin, and market volatility AID - 10.3905/jpm.1989.409233 DP - 1989 Oct 31 TA - The Journal of Portfolio Management PG - 45--52 VI - 16 IP - 1 4099 - https://pm-research.com/content/16/1/45.short 4100 - https://pm-research.com/content/16/1/45.full