There are many close answers, but none that are correct so far.
Most credit card companies don’t care if you pay in full, because they aren’t holding the debt. When you get a Visa card from your bank, Visa isn’t holding your debt and collecting the interest. The bank is the one doing that. Visa makes its money by collecting credit card fees from retailers. The retailers are willing to pay this because cash is for hookers and drug dealers, and most want to expand their customer base.
AMEX, on the other hand, is actually the issuer of the card and does hold your debt. So, they do care if you incur interest penalties or not. They also care if you pay off that debt. But as long as most people aren’t paying off in full each month or defaulting on their payments, they’re not in any danger.
However, even if you pay off your balance in full, they are still collecting exorbitant transaction fees from retailers. This is why (in the US) you are more likely to see a retailer who doesn’t take AMEX than Visa.
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