According to a new report from Edmunds.com, sales of used cars were down 6% in the first quarter of 2013. New-car sales were up, but the pace of growth has slowed down greatly since the end of last year.

Is the economy slowing, or is something else going on? In this video, Fool.com contributor John Rosevear takes a closer look at the numbers -- and at some emerging trends that could favor automakers like Ford (NYSE:F).