> Do you think it costs Visa 66% more to process a payment in the US than Australia? The answer is, of course, it doesn't.

I know literally zero about credit cards beyond what I know as a user, but I can imagine a couple of reasons why that would be plausible, ranging from "There is more credit card fraud in the US" to "The market for credit card rewards in the US is more aggressive, and a 1.75% fee is a net loss for many US rewards cards". Can this really be dismissed out of hand like that?