Going by that theory why doesn't Visa just jack up their prices by 10x? After all what are merchants going to do, not accept Visa? Turns out yes, that's exactly what they will do. Look at the number of business that don't take Amex for example for the same reason. Large companies especially have enough leverage to negotiate their own deals with credit card operators, like Costco does with Visa.

Costco is a bit different. If I don't have a Visa, i can pay with cash, personal check, or debit card. Sure, I'd prefer to pay with credit card, but it's not a huge deal for me to use a debit card there.

With Uber, there simply isn't an alternative. If they don't accept Visa then i can't use a credit card (or most debit cards, since those go through the visa network too) and there isn't a reasonable way for me to pay at all.

> With Uber, there simply isn't an alternative. If they don't accept Visa then i can't use a credit card (or most debit cards, since those go through the visa network too) and there isn't a reasonable way for me to pay at all.

Uber takes Paypal, Venmo, Apple Pay, and Google Pay too. Any would let you use a bank account. You can also deposit cash into PayPal and I think Venmo as well.

> Going by that theory why doesn't Visa just jack up their prices by 10x?

They (in collusion with MasterCard) could jack up prices and then there's be an antitrust case against them.

Here's the thing, though - as long as they don't abuse their duopoly position, those anti-trust cases are weaker. And a policy of preferring to side with the customer in these disputes is not exactly viewed as abuse of the monopoly position.