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Visa is 54% of all card purchases, Mastercard is 23%, and together they're 100% of debit purchases.

Waaaaaay past any reasonable threshold for market power scrutiny.

But antitrust is currently dormant in the USA.




Discover and Amex debit cards exist.


Not sure what relevance that might have. It's antitrust law, not "monopoly law", and there's no legal requirement that no competitors exist in order for the law to be involved. Antitrust law is about market power, not some imaginary narrow definition of "monopoly".


I was simply refuting the claim that 100% of debit purchases are Visa + MC.




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