Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of web-based photo processor Shutterfly (Nasdaq: SFLY) fell nearly 12% when a Cowen & Co. analyst expressed concerns that aggressive price cutting by competitors such as Hewlett-Packard's (NYSE: HPQ) Snapfish would affect the company's fourth-quarter results.  

So what: At the same time, Shutterfly has also begun stiff-arming the likes of Groupon (Nasdaq: GRPN) and LivingSocial because daily-deals sites bring in marginally profitable customers, Fortune reported while citing news site TheFlyOnTheWall.com.

Now what: Add it up and you have a low-margin company struggling for scraps during the all-important holiday shopping season. No wonder Big Money investors are selling. Would you? Or would you rather buy shares of Shutterfly at current prices? Please weigh in using the comments box below.

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Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He didn't own shares in any of the companies mentioned in this article at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Google+ or Twitter, where he goes by @milehighfool. You can also get his insights delivered directly to your RSS reader.

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