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Costco in the US only accepts Visa. I have a membership, and it's an annoyance because all of my credit cards are Mastercard or Discover, so I have to use my Visa debit card.

Bank debit cards in the US all also use Visa or Mastercard networks.




Costco in the US used to only accept Amex.

I assume they changed to Visa because Visa offered a better deal.

Seems like the opposite of a monopoly.




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