I have been trying to cover Edward Glaeser’s weak posts on the Economix blog regarding high speed rail investment.  Ryan Avent at DC Streets blog has been doing a wonderful job breaking down the intellectual dishonesty of Glaeser’s work.   To add to points I have already raised, he writes:

Glaeser’s analysis assumes no population growth — he bases ridership on current metropolitan populations — and no shift in mode share over time, despite the fact that both Houston and Dallas have rates of transit ridership well below similar-sized cities (suggesting that with growth, transit’s share will increase) and are rapidly constructing new systems to facilitate greater transit use.

If one adjusts anticipated ridership figures to correct for these errors, and if one uses a more realistic figure for the value of business traveler time, then benefits appear to come quite close to or exceed costs of construction.


Glaeser makes more mistakes as he goes on. He appears to use the fuel efficiency for passenger cars — 22 miles per gallon — even though nearly half of the nation’s households vehicle fleet consists of light trucks, which average only 18 miles per gallon.

If you like what you see, you can see Avent take on Eric Morris (of Freakonomics fame) as well and the assumptions he writes about regarding transportation in the Times.

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