Earlier quoted context omitted.
The challenger to these will solve for a different problem. Not every transaction needs complex fraud detection or being able for the customer do to chargebacks. For a 3% discount, would customers agree to use something that worked just like cash, where the transfer was instant and couldn't be undone? Then you don't have to worry about fraud, chargebacks, etc.
> For a 3% discount, It is fantasy to think they'd get a 3% discount. The goods in stores that take only cash do not tend to be cheaper than those that do. They know what people are willing to pay and will charge the price. If they see people are willing to pay $99 with a credit card, then they'll be willing to pay that with cash.
I didn't see this anywhere else though. It probably made sense for computer shops because most transactions one would do there would be sporadic, big, and planned.
(Since then, the Mastercard/Visa fees went down to 0.2-0.3% due to EU rules, so probably those discounts are less popular now).