Anne C. Gielen

Profit Sharing for Increased Training Investments

This article investigates whether paying a profit‐related wage stimulates training investments. The results point to increased worker effort and wage flexibility as two channels through which profit sharing enhances investments in training. While both effects are found for young workers, for older workers, profit sharing mainly affects training investments through greater worker effort. The results suggest that profit sharing can be especially useful for stimulating training among older workers, a growing group in the labour force with a relatively weak labour market position due to a lack of training.

Prenatal Testosterone and the Earnings of Men and Women

Testosterone, which induces sexual differentiation of the male fetus, is believed to transfer from males to their littermates in placental mammals. Among humans, individuals with a male twin have been found to exhibit greater masculinization of sexually dimorphic attributes relative to those with a female twin. We therefore regard twinning as a plausible natural experiment to test the link between prenatal exposure to testosterone and labor market earnings. For men, the results suggest positive returns to testosterone exposure. For women, however, the results indicate that prenatal testosterone does not generate higher earnings and may even be associated with modest declines.