Arthur O Sullivan — Urban Economics 8th Edition

O’Sullivan cites evidence that patent citations (one measure of useful knowledge spillovers) are far more likely to occur between inventors located within a few miles of each other than across the country, even in the age of Zoom. This is the "urban density" effect quantified.

Arthur O’Sullivan’s Urban Economics (8th edition) is a classic text that makes a typically dry, model-heavy subject surprisingly engaging. Here’s one particularly interesting piece or insight from the book that stands out: Arthur O Sullivan Urban Economics 8th Edition

So the interesting takeaway: Urban economics isn't about geography—it's about the trade-off between space and connection. And the 8th edition does a brilliant job showing why cities still win that trade-off. Arthur O Sullivan Urban Economics 8th Edition