Credit cards generally cause people to spend more money because it becomes easier to spend money. On the other side of this, the interest on credit card debt removes money from the overall economy so people have less money to spend. If you have your typical $10,000 credit card debt (I believe the US national average is about this much), at 20% interest, that means $2,000 per year per person is leaving the economy and going to credit card companies. I tend to think of credit card (and insurance) companies as black holes because the only way you'll see a return is by being a share holder, which most people are not. Thoughts/opinions?