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.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
14910.
Length: Date of creation: Apr 2009 Date of revision: Handle: RePEc:nbr:nberwo:14910
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Find related papers by JEL classification: F1 - International Economics - - Trade F15 - International Economics - - Trade - - - Economic Integration F4 - International Economics - - Macroeconomic Aspects of International Trade and Finance F43 - International Economics - - Macroeconomic Aspects of International Trade and Finance - - - Economic Growth of Open Economies O4 - Economic Development, Technological Change, and Growth - - Economic Growth and Aggregate Productivity
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