PT - JOURNAL ARTICLE AU - Robert C Merton TI - Editor’s Letter AID - 10.3905/JPM.2010.36.2.001 DP - 2010 Jan 31 TA - The Journal of Portfolio Management PG - 1 VI - 36 IP - 2 4099 - https://pm-research.com/content/36/2/1.short 4100 - https://pm-research.com/content/36/2/1.full