Josef Bajzík, Tomas Havranek, Zuzana Irsova, Jiri Schwarz, 23 September 2020

A key parameter informing policy models in international economics is the elasticity of substitution between domestic and foreign goods, also known as the Armington elasticity. Yet elasticity estimates have varied widely since Armington’s seminal 1969 contribution. This column considers 3,524 previous estimates and discusses how these historical analyses can be corrected for various biases. The previous research implies that the elasticity lies in the range 2.5-5.1 with a median of 3.8. In a simple model this translates to a trade cost elasticity of 2.8. 

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