More mothers engage in marketplace work today than ever before, with over 33% returning to work by the time their child is 3 months old. This article identifies the effects of maternal marketplace work in the initial months of an infant’s life on the child's cognitive development. Results suggest that such work in the first year of a child’s life has detrimental effects. Where significant, the results also indicate negative effects of maternal employment in the child’s first quarter of life. However, the negative effects of maternal marketplace work are partially offset by positive effects of increased family income.

We analyze the relationship between how long an employer has been in business (firm age) and wages. Using data from special supplements to the Survey Research Center’s monthly Survey of Consumers, we find that firms that have been in business longer pay higher wages (as previous studies found), but when we control for worker characteristics, the relationship becomes insignificant or negative. There is some evidence that the relationship is not monotonic, with wages falling and then rising with years in business. Established employers appear to make greater use of back‐loaded compensation, consistent with their higher probability of remaining in business.

The 1918–47 employee records of the Ford Motor Company provide a rare opportunity to study a firm willing to hire black workers when similar firms would not. The evidence suggests that Ford did profit from discrimination elsewhere, but not by paying blacks less than whites. An apparent “wage‐equity constraint” prevailed, resulting in virtually no racial variation in wages inside Ford. An implication was that blacks quit Ford jobs less often than whites, holding working conditions constant. Arbitrage profit came from exploiting this nonwage margin, as Ford placed blacks in hot, dangerous foundry jobs where quit rates were generally high.

Making use of performance data for baseball players, this article provides empirical evidence in support of Lazear’s (1998) theoretical predictions that (1) risky workers will earn a premium for their upside potential, (2) this risk premium will be higher the longer a worker’s work life, and (3) firms must enjoy some comparative advantage in the labor market to be willing to pay a premium to risky workers. The validity of Lazear’s predictions carries implications for wage differentials between young and old workers and between men and women.