[tanzam75]

Before 2013, Visa and Mastercard forbade credit card surcharges. However, cash discounts were allowed.

The problem was the Most Favored Nation clause in the credit card contracts. Merchants could offer cash discounts, but they could not offer discounts to non-Visa credit cards.

Since the antitrust settlements, all four U.S. credit card networks have allowed surcharges. Also, the Most Favored Nation clause only applies to "equal or higher cost" competitors.

Walmart US could fight Visa by adding a surcharge only to Visa cards. Walmart Canada cannot. In 2013, a similar antitrust case was dismissed in Canada.