Sure, it's a negotiation ploy, but Visa has more to lose than Walmart. Walmart Visa customers will just switch over to Mastercard or American Express. Costco al

Sure, it's a negotiation ploy, but Visa has more to lose than Walmart. Walmart Visa customers will just switch over to Mastercard or American Express. Costco also doesn't take Visa, but they do take Mastercard. It's clear that Mastercard will negotiate, but Visa seems to think they're above that.