AmEx Ratchets Up Rewards Spending in the War for Premium Cardholders
American Express Co. chip credit cards are arranged for a photograph in Washington, D.C., U.S. (Photographer: Andrew Harrer/Bloomberg)

AmEx Ratchets Up Rewards Spending in the War for Premium Cardholders

(Bloomberg) -- American Express Co. is pulling out the big bucks to keep its stronghold on premium credit-card users.
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