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...

U.S. state pensions are underfunded by trillions of dollars, but their economic burden is unclear. In a model of inefficient taxation, real estate fully reflects the cost of pension shortfalls when it is the only form of immobile capital. We study the effect of pension shortfalls on real estate...

A large body of evidence finds that relative mobility in the US has declined over the past 150 years. However, long-run mobility estimates are usually based on white samples and therefore do not account for the limited opportunities available for non-white families. Moreover, historical data...

Large and rapid upswings in illicit drug use display similar properties to infectious disease epidemics. In this chapter, we review research to understand what causes drug epidemics and how they end. Drug market actors are subject to both positive and negative reinforcement that lead to rapid,...

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...

This paper focuses on the price of nails since 1695 and the proximate source of changes in those prices. Why nails? They are a basic manufactured product whose form and quality have changed relatively little over the last three centuries, yet the process for producing them has changed...

This essay is the introduction to a book of the same title, forthcoming in summer of 2021 from Oxford University Press. The purpose is to document the ways in which patent systems are products of battles over the economic surplus from innovation. The features of these systems take shape as...

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...

The Social Security trust fund will be exhausted in the early 2030s. The U.S. government will need to make a choice about how to address the impending trust fund exhaustion, but it is unclear what it will choose to do. This indecision leaves young and middle-aged workers not knowing whether they...

This paper introduces the concept of "climate matching" as a driver of migration and establishes several new results. First, we show that climate strongly predicts the spatial distribution of immigrants in the US, both historically (1880) and more recently (2015), whereby movers select...