Many of Wal-Mart's 140 million weekly shoppers are feeling the pressure of underemployment, high gas prices, increased payroll taxes and a looming cut in food stamp benefits, the retailer's Chief Merchandising and Marketing Officer Duncan Mac Naughton said at a summit. The retailer is responding by cutting costs everywhere including "how we load our trucks, how we stock our shelves, how we check people out of the store, how we buy, how we source products, how we negotiate with our supplier partners," he said.

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