The Causal Effect of Transport Infrastructure: Evidence from a New Historical Database

In this paper, we analyze the effect of transport infrastructure investments in railways on three measures of local economic activity: real nonagricultural income, agricultural land values and population size. As a testing ground, we use data from a new historical database that includes annual panel data on approximately 2,400 regions, i.e., local governments, during the period 1860-1917. We use a staggered event study design that is robust to treatment effect heterogeneity. Importantly, we find extremely large reduced-form effects of having access to railways. For real nonagricultural income, the cumulative treatment effect is approximately 120% after 30 years. Therefore, this effect is 20 times larger than most reduced-form effects found in previous works on the effect of transport infrastructure on economic activity. Equally important, we also show that our reduced-form effect reflects growth rather than a reorganization of existing economic activity.