The notion of cars as holiday gifts sprang from the imagination of an ad agency more than a decade ago. But in recent years, many of the industry's marketing minds have enthusiastically embraced it - and so have car buyers. Together, they have helped turn December, once a sleepy month for U.S. auto sales, into one of the top selling periods, year after year. December is projected to be 2014's fourth-best month for new-vehicle sales, quite a feat since this December has only four sales weekends rather than five. TrueCar is forecasting December industry sales of just more than 1.5 million light vehicles, which would place this month behind May's 1.61 million, August's 1.59 million and March's 1.54 million - all of them considered key months for auto sales.
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