Question: Ford, Chrysler, and General Motors bought spark plugs for their cars from three or four independent spark plug manufacturers. To gain an advantage, Ford bought one of the manufacturers that had 15 percent of the market in the United States. The United States brought suit against Ford, claiming that this purchase would lessen competition among the independent manufacturers. Is the U.S. government right? (Ford Motor Co. v United States, 405 U.S. 562)