[cactus2093]

In the US every merchant factors in an extra 3-4 cents on every dollar for credit card transaction costs on all of their prices. If you pay with cash or debit card you eat that cost yourself, if you pay with a credit card you can make back like 2 - 4 cents of that amount depending on the purchase category, and it can really add up over time.

It's a very bizarre system, and incredibly regressive, and would actually probably be pretty simple to get rid of with federal legislation. I actually can't believe none of our current wave of progressive politicians have thought to come after it yet.