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Fortune reports that Walmart-owned Sam's Club is hoping to take advantage of recent travails at Costco over its switch from American Express to Citi Visa as its exclusive partner. Between now and July 4, Sam's announced, people with Costco membership cards can use them to shop at any Sam's Club.

The move is part of a broader effort being engineered by Sam's management to get more competitive. Sam's also has begun offering self-checkout and store pickup, as well as a stronger food offering.
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