PT - JOURNAL ARTICLE ED - Kahn, Ronald N TI - Invited Editorial Comment AID - 10.3905/JPM.2010.36.2.005 DP - 2010 Jan 31 TA - The Journal of Portfolio Management PG - 5--6 VI - 36 IP - 2 4099 - https://pm-research.com/content/36/2/5.short 4100 - https://pm-research.com/content/36/2/5.full