Why Wal-Mart's sales should have everyone worried

(Fortune) -- It certainly looks like happy days are here again. Many of the nation's biggest retailers, including Saks, Hewlett-Packard, Home Depot, and Target have released cheery sales reports. April's jobs reports showing a slight increase in the workweek and pay for workers, and more hiring across the board.

And then there is Wal-Mart, whose happy yellow face switched to a grimace when it released first quarter sales on Tuesday.....read more

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