> 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 antit

> 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.