In recent years, there has been an increasing focus by policymakers on rural infrastructure in the United States, including most recently tax credits to encourage investment. Previous work has documented the importance of railroad expansion for nineteenth century development, and demonstrated...

We investigate the costs of transportation regulation using the example of agricultural markets in the United States. Using a large database of prices by state of agricultural commodities, we find that the coefficient of variation (as a measure of market integration between states) falls for...