The Walmart consumer is revealing a troubling new side to the economy. As American consumers are seemingly driving the recovery forward, lower-income households are getting left behind. The retail giant reported Thursday a surprise drop in sales for the latest three months and offered a very cautious outlook for the rest of the year. (Read more: Wal-Mart sales slip, outlook 'cautious') "During the first half of the year, we saw consumers in both mature and emerging markets curb their spending, and we believe these trends will persist through the remainder of the year," said Wal-Mart's chief financial officer Charles Holley. That's not what's happening to overall consumer spending, according...
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