Earlier this month, the French supermarket giant Carrefour placed signs throughout its stores informing customers that it no longer planned to sell PepsiCo products of any sort. That meant no Cheetos, Doritos, or Quaker cereals—and certainly no Pepsi or 7-Up. The reason, Carrefour said, was the food giant’s “unacceptable” price increases. A brouhaha soon broke out in the press, with PepsiCo saying it had made the decision to break things off, and Carrefour countering that that was not the case. ...