Abstract
The authors examine the relationship between large infrastructure spending, of the type implied by interstate highway construction, and the level of economic activity. By collecting historical data on interstate highway construction and economic activity in the United States at the country level, the authors find that highways have a differential impact across industries: certain industries grow as a result of reduced transportation costs, whereas others shrink as economic activity relocates. Additionally, the authors find that highways affect the spatial allocation of economic activity. They raise the level of economic activity in the countries that they pass directly through, but draw activity away from adjacent countries. (A)