Diego Comin, Mikhail Dmitriev, Esteban Rossi-Hansberg, 26 November 2012

Geographical distance is a fundamental impediment to virtually all economic transactions. This column, using data on technology adoption in 161 countries over 140 years, argues that it also inhibits the spatial diffusion of technology. Moreover, it shows that technology spreads like an epidemic. As more people adopt a technology, the importance of distance to the technological leader diminishes until it eventually becomes irrelevant.

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