It seems obvious that lowering the cost of communication among innovators would facilitate scientific and technological progress. Yet, few studies examine this relationship. This column explores the introduction of the first modern postal system in Britain in 1840 and its effect on the number of citations between pairs of scientists and on patenting. The gradient with which citations declined with distance-based postage costs fell and patenting increased in locations that experienced more significant improvements in letter market access due to the reform.
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