PT - JOURNAL ARTICLE AU - Robert E. Penn TI - The Economics of the Market in Modern Prints AID - 10.3905/jpm.1980.408779 DP - 1980 Oct 31 TA - The Journal of Portfolio Management PG - 25--32 VI - 7 IP - 1 4099 - https://pm-research.com/content/7/1/25.short 4100 - https://pm-research.com/content/7/1/25.full