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How large are the benefits of transportation infrastructure projects, and what explains these benefits? To shed new light on these questions, this paper uses archival data from colonial India to investigate the impact of India's vast railroad network. Guided by four predictions from a general equilibrium trade model, I find that railroads: (1) decreased trade costs and interregional price gaps; (2) increased interregional and international trade; (3) increased real income levels; and (4), that a sufficient statistic for the effect of railroads on welfare in the model (an effect that is purely due to newly exploited gains from trade) accounts for virtually all of the observed reduced-form impact of railroads on real income in the data. I find no spurious effects from over 40,000 km of lines that were approved but - for four different reasons - were never built.

Zonder onderwerpscode: economie

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When asked to name one proposition in the social sciences that is both true and non-trivial, Paul Samuelson famously replied: 'Ricardo's theory of comparative advantage'. Truth, however, in Samuelson's reply refers to the fact that Ricardo's theory of comparative advantage is mathematically correct, not that it is empirically valid. The goal of this paper is to assess the empirical performance of Ricardo's ideas. We use novel agricultural data that describe the productivity in 17 crops of 1.6 million parcels of land in 55 countries around the world. Crucially, this dataset contains information about the productivity of each parcel of land in all crops, not just those that are currently being grown. This direct information about relative productivity differences across economic activities allows us to compute, for the first time, the output predicted by Ricardo's theory of comparative advantage. Despite all of the real-world considerations from which this theory abstracts, we find that Ricardo's theory of comparative advantage has significant explanatory power in the data, at least within the scope of our analysis.

Zonder onderwerpscode: economie

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How large are the intra-national trade costs that separate consumers in remote locations of developing countries from global markets? What do those barriers imply for the intra-national incidence of the gains from falling international trade barriers? We develop a new methodology for answering these questions and apply it to newly collected CPI micro-data from Ethiopia and Nigeria (as well as to the US). In order to overcome three well-known challenges that arise when using price gaps to estimate trade costs, we: (i) work exclusively with a sample of goods that are identified at the barcode-level (to mitigate bias due to unobserved quality differences over space); (ii) collect novel data on the origin location of each product in our sample (to focus only on the pairs of locations that actually identify trade costs); and (iii) use estimates of cost pass-through to correct for mark-ups that potentially vary over space (to extract trade costs from price variation in an environment with potentially oligopolistic intermediaries). Without these corrections, we find that our estimates of the cost of distance would be biased downwards by a factor of approximately four. Our preferred estimates imply that the effect of log distance on trade costs within Ethiopia or Nigeria is four to five times larger than in the US. We also use our pass-through estimates to calculate the incidence of surplus increases due to falling world prices. We find that intermediaries capture the majority of the surplus, and that their share is even higher in distant locations, suggesting that remote consumers see only a small part of the gains from falling international trade barriers.

Zonder onderwerpscode: economie

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