Innovation policy can be a crucial component of governments' responses to crises. Because speed is a paramount objective, crisis innovation may also require different policy tools than innovation policy in non-crisis times, raising distinct questions and tradeoffs. In this paper, we survey the...

AT&T was the largest U.S. firm for most of the 20th century. Telephone operators once comprised over 50% of its workforce, but in the late 1910s it initiated a decades-long process of automating telephone operation with mechanical call switching--a technology first invented in the 1880s. We...

I study the impact of transportation on health in the rural US, 1820-1847. Measuring health by average stature, I find that greater transportation linkage, as measured by market access, in a cohort's county-year of birth had an adverse impact on its health. A one-standard deviation increase in...

Since the beginning of the COVID-19 pandemic, policymakers, researchers, and journalists have made comparisons to World War II. In 1940, a group of top U.S. science administrators organized a major coordinated research effort to support the Allied war effort, including significant investments in...

Immigrant distribution--the geographic dispersion of immigrants in the destination country--was a major issue in the United States in the late Age of Mass Migration. Policy debates were influenced by the widely held view that the new immigrants were generally less geographically mobile within...

After adjusting for sample-selection bias, I find a net decline in average stature of 0.64 inches in the birth cohorts of 1832--1860 in the US. This result supports the veracity of the Antebellum Puzzle--a deterioration of health during early modern economic growth in the US. However, this...

Why were the poorer countries of the European periphery latecomers to the Age of Mass Migration? We test the diffusion hypothesis, which argues that mass emigration was delayed because it was primarily governed by a gradual process of spatial diffusion of migration networks. We propose a model...

I study the internal migration of native-born white men in the United States using linked census data covering all possible 10- and 20-year periods 1850--1940. Inter-county migration rates were stable over time. Selection into migration on the basis of occupational status was also largely stable...