How can economists be confident that the pill itself is responsible for the increases in female labor force participation?
A. States that legalized the pill earlier also had earlier increases in female labor force participation.
B. Starting from 1960, the year the pill was approved for sale, female labor force participation has been rising.
C. States that legalized different versions of the pill had different patterns of female labor force participation.
D. It seems to be common sense that delaying childbearing would increase labor force participation.
Ans: A. States that legalized the pill earlier also had earlier increases in female labor force participation.
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