, Columnist
Size Isn't Everything, Big Auto
Slumping U.S. sales highlight a problem: If you make a lot of cars, you have to sell them, too.
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Once upon a time, the battle for the crown of world's biggest automaker was a one-horse race.
Since overtaking Ford Motor Co.'s sales in 1931 -- not that long after the last Model T rolled off the production line -- General Motors Co. was the undisputed global market leader for the best part of eight decades.