What drove western population growth in the U.S. during the 19th century? The facts are: (i) The birth ratio was higher in the West than in the East. Both exhibited a secular decline. (ii) Between 1800 and 1810 net migration accounted for 88% of the rate of population growth in the northwest...

We formulate a version of the growth model in which production is carried out by heterogeneous plants and calibrate it to US data. In the context of this model we argue that differences in the allocation of resources across heterogeneous plants may be a significant factor in accounting for...

We develop a quantitative theory of gender differences in labor market participation, hours worked, labor turnover, and human capital accumulation. In our theory, young females expect to face higher labor turnover and to work less hours than males because they allocate time to child rearing. As...