We found that these patterns hold up in virtually all cases under a variety of alternative
specifications and estimation methods. An innovative feature of one of these alternatives is to
control for the selection into marriage, an important exercise since the incidence of marriage has
been falling steadily. This raises the possibility that the sample of married women has become
more “marriage-prone” over time relative to the whole population of women, and this
compositional shift could influence measured labor supply elasticities among married women.
However, our results hold up even when we account for this compositional factor.