Studies show mothers pay a wage penalty of roughly 5 to 7 percent per child, and in audit experiments identical resumes from mothers drew half the callbacks of childless women. In December 1971 a universal, sliding-scale childcare act passed both chambers with bipartisan support. President Nixon vetoed it, warning against communal approaches to child rearing, and the override failed by fifteen votes.
How much of the motherhood penalty is discrimination versus lost experience, hours and occupational choice is unsettled; Correll's experiments prove hiring bias exists but not what share of lifetime wage gaps it explains.



