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Trade and Income -- Exploiting Time Series in Geography

James Feyrer

No 14910, NBER Working Papers from National Bureau of Economic Research, Inc

Abstract: Establishing a robust causal relationship between trade and income has been difficult. Frankel and Romer (1999) use a geographic instrument to identify a positive effect of trade on income. Rodriguez and Rodrik (2000) show that these results are not robust to controlling for omitted variables such as distance to the equator or institutions. This paper solves the omitted variable problem by generating a time varying geographic instrument. Improvements in aircraft technology have caused the quantity of world trade carried by air to increase over time. Country pairs with relatively short air routes compared to sea routes benefit more from this change in technology. This heterogeneity can be used to generate a geography based instrument for trade that varies over time. The time series variation allows for controls for country fixed effects, eliminating the bias from time invariant variables such as distance from the equator or historically determined institutions. Trade has a significant effect on income with an elasticity of roughly one half. Differences in predicted trade growth can explain roughly 17 percent of the variation in cross country income growth between 1960 and 1995.

JEL-codes: F1 F15 F4 F43 O4 (search for similar items in EconPapers)
Date: 2009-04
New Economics Papers: this item is included in nep-dev and nep-int
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Published as James Feyrer, 2019. "Trade and Income—Exploiting Time Series in Geography," American Economic Journal: Applied Economics, vol 11(4), pages 1-35.

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