If a business takes both cash and cards, allowing cards In Addition to already taking cash, does not cost more. It costs a lot less.
But don't take my word for it. Just look at how many places kept trying to offer discounts for cash, how hard and for how many decades the card companies lobbied against that, and how many places do that now since it became illegal for credit cards to force that into their vendor agreements.
Let me give you an example of the logic used for the statement. A 5 ton truck is faster than a porshe 911.
When the truck is cruising on the highway and the porshe is starting off a red light.