Please, oh please- give me a source for this information. Also, supply me with a list of stores that are cash only.
I second that. There are a *LOT* of comments from people here who have half formed ideas about how the whole process works, what the costs are, etc.
I have my own business. We sell on the Internet and do trade shows.
We pay 3% on non-present cards (any card) via Stripe.com (and SquareSpace).
At trade shows we use Square which gives us better rates 2.5% on swipes, but not nearly as good as the 1.8% + .30 cents we would get on MC/VI (more on AX and DI) if we had our own terminal that was used everyday (via Costco). Since we only occasionally do trade shows, unlike a standard merchant, the monthly fees more than offset the lower swipe rate.
As to cash being cheaper and the cash prices being cheaper, if we were cash only it would *cost* us money. Not only for all the counting and handling costs but also due to lost sales. It is simply a fact that for items over a certain amount, people are more comfortable using credit cards.
Why? First, our customers have security that the product will arrive and is as described (if not we would get a chargeback and they would get a refund from their card issuer). Second, they are not walking around and flashing large amounts of currency that is at risk from a lost or robbed wallet. Third, if their credit card is compromised, they have no liability (debit is a little trickier because although there is a 0 fraud policy, the issue is that while that is worked out between you and your bank, **your checking account will generally not be refunded the contested amount**...this is unlike a credit card where your dispute amount will be credited to your account while the investigation is ongoing).
So, yes, for small purchases the fees and per swipe charges for a merchant may lead to "No credit card sales below $x". Or no credit cards in dollar or thrift stores because of the interchange and equipment/statement monthly fees, etc. Though even for these merchants, something like Square probably makes sense if they thought it through because of the flat fee, no equipment/statement fees, and ability to use cell phones to process (no need for a dedicated land line).
But for a purchase of any size, the competitive necessity plus the convenience of money handling almost always means credit cards will be accepted. And by increasing sales volume and lowering cash handling costs they could often end up giving customers lower prices.