Americans who are fed up with the stock market's volatility are turning to an investment that seems to promise a smoother ride: collectible cars. According to a study by the automobile-auction company Barrett-Jackson, the billion-dollar collectible-car industry is growing at a 10% clip annually. "The baby boomers are fueling this long-term trend," explains Craig Jackson, president of Barrett-Jackson. "They want to own the cars of their youth." Coveted wheels include '50s sports cars like the Corvette and muscle cars of the late '60s and early '70s like the Pontiac Ram Air IV GTO.
As with most investments, there is no guarantee...