Shares of Discover Financial Services slumped the most in more than a decade after credit card lender warned that it will spend more on marketing and technology, including to beef up collections on troubled debt.

The credit card lender has seen problem loans spike since it introduced a feature that lets at-risk customers restructure loans through its online and mobile channels.

American Express has focused the past few years on overcoming a couple of its stigmas — that not all U.S. merchants accept Amex cards, and that younger cardholders were not intrigued by the status of holding an Amex card.

The city would join San Francisco and Philadelphia among cities that prohibit stores and restaurants from only accepting electronic payments.

JPMorgan Chase & Co. and United Airlines Holdings Inc. sweetened rewards on their credit cards as the companies continue to renegotiate the terms of their longtime partnership.

It might sound like a risky strategy at a time when millions of Americans are drowning in debt, but that's exactly what big banks have been doing lately.

It might sound like a risky strategy at a time when millions of Americans are drowning in debt: keep raising the limit on people’s credit cards, even if they don’t ask.

While not as large as the U.S. both in number of people and number of credit card owners, the U.K. remains a very lucrative market for issuing banks and card networks, as well as a host of alternative financial service providers catering to younger, underserved consumers.

Fears that the New York banking giant’s consumer lending product could cut into a key credit union market appear to have been overblown.

The New York bank said Wednesday that its first-ever credit card has brought in nearly $2 billion of loans in less than six months.