Using time-diary data from the U.S. and six wealthy European countries, I demonstrate that non-partnered mothers spend slightly less time performing childcare, but much less time in other household activities than partnered mothers. Unpartnered mothers' total work time--paid work and household...

The previously documented trend toward more co- and multi-authored research in economics is partly (perhaps 20 percent) due to different research styles of scholars in different birth cohorts (of different ages). Most of the trend reflects profession-wide changes in research style. Older...

Economists' productivity, as measured by publication in leading journals, declines very sharply with age. Additional evidence shows that this is a rational response to economic incentives and/or changing physical or mental abilities: There is no difference by age in the probability that an...