Why are some cities specialized and others diversified? What are the advantages and disadvantages of urban … specialization and diversity? To what extent does the structure of cities, and the activities of firms and people in them, change … over time? How does the sectoral composition of cities influence their evolution? To answer these and related questions, we …

Firms are more productive on average in larger cities. Two explanations have been offered: agglomeration economies … (larger cities promote interactions that increase productivity) and firm selection (larger cities toughen competition allowing … selection model and a standard model of agglomeration. Stronger selection in larger cities left-truncates the productivity …

Why are some cities specialized and others diversified? What are the advantages and disadvantages of urban … specialization and diversity? To what extent does the structure of cities, and the activities of firms and people in them, change … over time? How does the sectoral composition of cities influence their evolution? To answer these and related questions, we …

To identify communication externalities in French cities, we exploit a unique survey recording workplace communication … of individual workers. Our hypothesis is that in larger and/or more educated cities, workers should communicate more. In …

We propose a theory of skill mobility across cities. It predicts the well documented city size--wage premium: the wage … distribution in large cities first-order stochastically dominates that in small cities. Yet, because this premium is reflected in … skilled disproportionately sort into the biggest cities, while those with medium skill levels sort into small cities. The …

fundamental fact: what matters for the ecological outcome of cities is the mix between the level of population density and the … higher population density makes cities more environmentally friendly. However, once we account for the fact that cities may … be either monocentric or polycentric as well as for the possible relocation of activities between cities, the …

-schooling externalities in US cities between 1970 and 1990. …

human capital and human capital externalities in cities. Our estimates imply that a one year increase in average schooling … in cities increases their aggregate labour productivity by 8 to 11%. We find no evidence for aggregate human capital … externalities in cities however, although we use three different approaches. Our main theoretical contribution is to show how human …

structure, from a configuration where cities specialize by sector and host integrated headquarters and production plants, to a … configuration where cities specialize by function, with headquarters from different sectors and business services clustered in a few … large cities and production plants from each sector clustered in smaller separate cities. …