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 Trina Solar (NYSE: TSL) fell more than 13% in early trading after American solar-panel manufacturers complained to the Commerce Department about cheap Chinese imports from the likes of Trina and Suntech Power (NYSE: STP). The stock closed down 11%.

So what: Trina has had both ups and downs over the past several months, with more ups recently as Germany -- a major consumer of solar imports -- prepares to reduce tariffs. Of course, Trina won't be the only supplier to benefit from the changes or from a more stable European economy.

Now what: Yet it's Trina that trades for just 0.16 times sales, a multiple that effectively says each dollar of revenue is worth just $0.16 -- even when you factor in expected growth. I can't see how that's fair under any circumstances. Do you agree? Would you buy shares of Trina Solar at current prices? Please weigh in using the comments box below.

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