Since we're on the subject, as well as the supply, I'd also like to mention the "demand" side.  People in the cities keep wondering why anyone would shop there, but they're really capitalizing on the misery of small, dying towns.  I call it economic strip-mining.

They go into these places, promising jobs and reasonable prices, and they get all kinds of tax breaks.  While they're open, the smaller businesses die off.  When the tax breaks expire, they just abandon the towns.  

A family member of a friend of mine is a Republican Mayor of just such a town and he's been fighting tooth and nail to keep Wal-mart out.  He lost.  Local stores are laying people off before the damned Wal-mart is even open.

Maybe we can eventually make language a complete impediment to understanding. -Hobbes