Plant-level data from the Longitudinal Research Database of the US Bureau of the Census are employed to estimate the impact of agglomeration economies on industry productivity across US metropolitan areas. This analysis seeks to remedy three shortcomings of previous empirical studies of...

How much heterogeneity in techniques of production exists within the economy, and how does that heterogeneity move over time? In this paper we show that the range of production techniques employed by establishments within individual manufacturing industries is large. We go on to show that...