%0 Journal Article %A Robert E. Penn %T The Economics of the Market in Modern Prints %D 1980 %R 10.3905/jpm.1980.408779 %J The Journal of Portfolio Management %P 25-32 %V 7 %N 1 %U https://jpm.pm-research.com/content/iijpormgmt/7/1/25.full.pdf