In a 5 to 4 opinion, the U.S. Supreme Court ruled June 25 in favor of American Express in litigation concerning Amex’s prohibition against any merchant in its U.S. network requesting a cardholder to use an alternative payment method. Merchants claimed the anti-steering rules limited their options to cut costs for credit card acceptance. Attorneys general from 17 states and the U.S. Department of Justice challenged the Amex policy in litigation filed in 2010. In 2015, a federal district court ruled in favor of the Justice Department and the attorneys general. However, a year later, the U.S...