The exception is more important than the rule of knowledge distance decay at Pacific Standard magazine.
Theme: Geography of knowledge transfer.
Subject Article: "Study details the quirky geography of knowledge-sharing: Research indicates how man-made boundaries limit patent citations."
Other Links: 1. "Geographic Constraints on Knowledge Spillovers: Political Borders vs. Spatial Proximity."
2. "It's a Flat World, After All."
3. "New light on the German pork butchers in Britain (1850 – 1950)."
4. "Migration, Transfer and Appropriation: German Pork Butchers in Britain."
5. "Prediction Markets at Google."
Postscript: Cities aren't knowledge production engines because of density. Migration drives the metro revolution. If new ideas didn't migrate into a city, then density won't make one lick of a difference. The big blind spot in the field of urbanism is the geography of knowledge transfer. The push for greater densities is a fetish based on a misunderstanding. The magic is migration.