Book Forum: Harford and Kevin Grier on Cities

Kevin Grier at Kids Prefer Cheese continues our book forum on the Logic of Life with a discussion of The World is Spiky.

Here is my summary of Tim’s argument. Cities are expensive, and that expense is above and beyond paying the necessary rents to gain access to their unique amenities. Cities are marked by knowledge spillovers, a positive externality (don’t get mad Bryan) where human capital grows faster when one is around more humans. And the internet, rather than reducing the positive effects of cities on productivity, actually enhances them. Thus, rather than subsidizing rural areas, perhaps we should consider subsidizing cities.

Luckily for Tim and his prospective book sales, he tells this story in a much more entertaining way than I just did. But I still have some questions, suggestions, and quibbles.

The claim is made that salary differences don’t match up with cost of living differences and the reason for this is knowledge spillovers, but it is not spelled out exactly how that would work. An alternative seems to me that zoning restrictions create these big rents and pre-existing property owners are sucking a lot of the consumer surplus out of people with high valuations on cool experiences.....

Tim discusses “failing cities” and describes (correctly I think) why people still live there, but gives no explanation for why they failed if indeed cities produce these positive externalities. There is no discussion of some of the very biggest cities in the world; Mexico City, Lagos, Jakarta. It would be nice to know where the argument works, where it doesn’t and how to know which is which...

More here.