In 1972, a Very Controversial Study Asserted That Income Differences

In 1972, a very controversial study asserted that income differences among individuals did not depend on genetic differences in reasoning ability, or differences between schools, or family background.Moreover, the effects of level of schooling are much less than previously understood.After controlling for all of these background variables, much of the variation in earnings appeared to be random.From this analysis, one might reach the very controversial conclusion that earnings depended to a very great extent on

A) human capital.
B) ability.
C) schooling.
D) luck.

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