History I / Urban Geography and City Systems
Practice question · Multiple choice

Why do cities exist at all?

Hints
  1. What does density buy that nothing else does?
  2. The densest artefact humans make, and the density is the point.
Show the answer

D. Proximity is productive: it lowers the cost of exchange

Why

Density is the product, not a side effect. It lowers the cost of exchanging, of finding the right person, and of copying what works, which was worth dying young for, and demonstrably was.

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