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American Express recently reported quarterly earnings, showing that its single-biggest expense was credit card rewards.
The warehouse retailer will accept only Visa come June, then bump membership fees.
Here are the numbers we're reading and watching for Friday.
As profits plummet, the company faces intense competition for affluent customers.
American Express is being squeezed by more demanding consumers and greater competition.
Collect points for paying your AT&T bill, redeem them for Hulu videos.
AmEx is out of the picture, but partnering with Costco is still alluring
The issuer of the famous Black Card is focusing on low-income financial services.
American Express will reveal a line of "League of Legends"-themed debit cards, in which cardholders can earn rewards points for in-game currency.
Starting Wednesday, American Express customers who link their cards to their Twitter accounts will be able to make purchases with a tweet.
