%0 Journal Article %A Marshall E. Blume %T Two Tiers - But How Many Decisions? %D 1976 %R 10.3905/jpm.1976.5 %J The Journal of Portfolio Management %P 5-12 %V 2 %N 3 %U https://jpm.pm-research.com/content/iijpormgmt/2/3/5.full.pdf