BENTONVILLE, Ark. -- Wal-Mart. Always.At least that's the way it seems anytime supermarket executives talk, whether they compete directly with Wal-Mart or not.Next year Wal-Mart Stores celebrates noteworthy anniversaries of its three food retailing formats. The first supercenter was launched in 1988 and has become a formidable force in gobbling up food dollars over a 15-year period. Sam's Club, launched

BENTONVILLE, Ark. -- Wal-Mart. Always.

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