[Jeffrey Ball of The New Republic] notes that many millennials who go carless live in a handful of mostly coastal cities. Read one way, this shows that it is not a widespread phenomenon. Read another, it proves that transportation preferences are malleable. Most of those millennials grew up in car-dependent suburbs. They stopped driving when they moved to cities because they now live somewhere denser, with fewer incentives to drive and better alternatives. Offer that same deal to Americans in other places, especially the poor, and many of them would gladly take it.