The top 12 luxury brands accounted for only 10.8% of total U.S. car sales through the first 11 months of this year. But these lines are important to the companies that own them because the profits on luxury cars tend to be higher than for other models. U.S. car companies ruled the domestic luxury market for decades. Mercedes-Benz USA was not formed until 1965, while Toyota Motor Corp.’s (NYSE: TM) Lexus brand was not launched until 1989.

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