Walter Williams hits another one out of the park by explaining how people choose to go to Wal-Mart, but are required to go to the Post Office or DMV. Since people must choose to go to Wal-Mart, they have an incentive to make the experience pleasant that simply doesn't exist at the DMV or Post Office.
Not that the DMV can't be pleasant from time to time, but it's simply a little bit more difficult to align incentives to assure that for them without the blessed profit motive.
Additional note; Pentamom notes correctly that Wal-Mart is not always a pleasant experience. The point here is not that all things good come from Bentonville, of course, but rather that Wal-Mart has the incentive to make things better due to their profit motive--especially when Target comes to town. Or Blumenkinder Heirlooms. :^)
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