Costco recently ended its long monogamous relationship with credit card partner American Express, leaving to only accept Visa cards and partner with Citibank for a store-branded card. AmEx could lose up to 10% of its customers over the switch, since the number of people who had cards with them just for Costco is huge. The switch went badly for some Costco customers who didn’t get their cards, couldn’t activate them, or had other problems with the switch. Citi’s CEO promises that he’s going to fix this. [More]
