Auto dealers routinely ignore manufacturers' vehicle sticker prices. But a recent U.S. Supreme Court ruling appears to give car companies greatly expanded power to set the retail prices that dealers charge, Autoweek reports. In a 5-4 decision, the U.S. Supreme Court overturned a nearly century-old ban on manufacturers setting minimum retail prices for products.The decision was viewed broadly as a blow to online sellers and discounters. Its impact on the auto industry is less clear, but it could boost no-haggle pricing and force more dealers to upgrade their facilities.The National Automobile Dealers Association said the court's decision could lead to higher vehicle prices. Dealers "know their local markets best, and each dealer should be free to set his or her prices individually," NADA said in a statement.