An AlixPartners study suggests that the frenetic auto sales pace of 2014 will begin to cool off in the near future.

Automakers and auto dealers better enjoy the good times while they last because new car sales are going to begin sliding after this year, with a serious drop off by 2017, according to a new study.

AlixPartners, a global business advisory firm, suggests automakers are going to get  chance to prove they can make money while selling 12 million vehicles a year in the near future. The industry is tracking for a 16-million to 16.5-million unit sales year right now, but they predict that’s all going to come to an end.

“The good news is the global auto industry made it through the financial crisis, recession and a whole lot of pain,” said John Hoffecker, co-president of the Americas at AlixPartners. “The bad news is what’s ahead is uncertain and unprecedented, and could be painful as well.”

The firm believes that a projected rise in interest rates and a lack of interest in car ownership by the next generation of drivers – especially with the advent of car-sharing services – will combine to crimp sales, starting next year.

“The biggest factor would be this credit bubble, and without making an exact projection of when that will happen, that, to use is the window when you’ll see an impact on car sales,” said Dan Hearsch, a director in the automotive practice at AlixPartners. “The other side of it is cyclical and predictable. We’re a little more pessimistic because of these other factors.”

The steady growth of the auto industry has been unprecedented, the study notes, which suggests it isn’t sustainable. By the end of 2013, the industry posted year-over-year sales growth for five consecutive years: just the third time since the end of World War II that has happened.

The study also points to what is described as a “QE Bubble,” or a liquidity bubble underpinned by the Federal Reserve’s current quantitative-easing actions. Some of the “air” in that “bubble” may begin leaking as the Fed starts undoing some of those actions. If that occurs, a hike in interest rates, which have been hovering at record lows for several years now, would occur adding to the price of a new car or truck.

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If consumer interest rates were to rise three percentage points – about the normal historical increase when rates go up in a managed fashion after a prolonged downward trend – that would translate into $2,500 less purchasing power for car buyers, according to the study. If they were to rise seven points, which is far less than the rise in the early 1980s recession, that would mean $5,250 less purchasing power.

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“The auto industry in North America is in what you might call a ‘perfect calm’ right now, but this remains very much a cyclical industry,” said Mark Wakefield, managing director at AlixPartners and head of the firm’s Automotive Practice in the Americas, in a statement.

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“If there’s a perfect unwinding of QE and its many international brethren, interest rates might rise moderately, which would likely dampen demand; but if it’s not done perfectly—and that’s a tall order – we could be looking at a steep sales downturn, and increased debt costs sooner than many are planning for.”

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