Throughout the imperial era, defensive walls surrounded Chinese cities. Although most city walls have vanished, the cities have survived. We analyze a sample of nearly 300 prefectural-level cities in China, among which about half historically had city walls. We document that cities that had...

It has been well documented that employment outcomes often differ considerably across areas. This paper examines the extent to which the local human capital level, measured as the share of prime age adults with a college degree, has positive external effects on labor force participation and...

Firms are more productive on average in larger cities. Two main explanations have been offered: firm selection (larger cities toughen competition, allowing only the most productive to survive) and agglomeration economies (larger cities promote interactions that increase productivity), possibly...

Using administrative data for West Germany, this paper investigates whether part of the urban wage premium stems from fierce competition in thick labour markets. We first establish that employers possess less wage-setting power in denser markets. Local differences in wage-setting power predict...

This paper examines the relationship between individuals' skills and labor market outcomes for the working-age population of Colombia's urban areas. Using a 2012 unique household survey, the paper finds that cognitive skills (aptitudes to perform mental tasks such as comprehension or reasoning)...

This study examines the effects of the extension of compulsory schooling from 5 to 8 years in Turkey in 1997 – which involved substantial investment in school infrastructure – on schooling outcomes and, in particular, on the equality of these outcomes between men and women, and urban and...

We analyze the first data set on consistently defined functional urban areas in Europe and compare the European to the US urban system. City sizes in Europe do not follow a power law: the largest cities are "too small" to follow Zipf's law

This paper estimates the link between population density and COVID-19 spread and severity in the contiguous United States. To overcome confounding factors, we use two Instrumental Variable (IV) strategies that exploit geological features and historical populations to induce exogenous variation...

I use the American Community Survey to examine how college earnings premiums differ across small metropolitan statistical areas (MSAs) in the U.S. I document that the West North Central Division (Plains Region) has especially low average college earnings premiums. Controlling for observable MSA...

This paper investigates certain issues of economic and ethnic segregation from the perspective of children in the three metropolitan regions of Sweden by using a relative new operationalization of the neighborhood concept. Neighborhoods are clustered by population share of visible immigrants in...