People who plan to own a stock for the long term should be investing based on the company's fundamentals. If those fundamentals deteriorate, that's a signal that it's time for you to reevaluate whether you should keep owning those shares.

So when Lululemon Athletica (NASDAQ: LULU) announced its third-quarter results on Dec. 8, something caught my eye: the retailer's growing inventory levels. That metric made me stop, think, and reconsider whether my underlying assumptions about the company were wrong -- or at least, in need of an update.

Image source: Getty Images.

Continue reading

Source Fool.com