economics of education . .
. () [] . Jean Fourasti Strumilin . . . .
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. . Walsh Psacharopoulus Woodhall . . .
residual factor. . Factorial . .
1909 - 1929 1929 - 1957 10% 19091929 21% 1929 1957 . 1950 - 1962 5% 15% . 20% 1929 1957 . . .
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: . .
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. . . . . .
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