Several months ago, we ran a quorum here about urbanization, pegged to the fact that more than half of the world�s population now lives in cities. Given the economic changes of the past several months, particularly those in the housing market and in energy prices, it seemed like a good idea to run a new quorum on suburbia, even if it might cover some of the same ground. So we gathered up a group of smart people and asked them the following: "What will U.S. suburbs look like in 40 years?" NYT Freakonomics Blog