| | Keynes's Internal Rate of Return |
 | | Firms were presumed to "rank" various investment projects depending on their "internal rate of return" (or "marginal efficiency of investment") and thereafter, faced with a given rate of interest, chose those projects whose internal rate of return exceeded the rate of interest. |
 | | Keynes defined the internal rate of return as the "marginal efficiency of capital", which Abba Lerner (1944, 1953), more accurately, rebaptized as the "marginal efficiency of investment" (MEI). |
 | | Now, Keynes himself appealed to Irving Fisher's (1930) notion - arguing that "Professor Fisher uses his "rate of return over cost" in the same sense and for precisely the same purpose as I employ the "marginal efficiency of capital"" (Keynes, 1936: p.141). |
| cepa.newschool.edu /het/essays/capital/keynesreturn.htm (2109 words) |