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 Chinese solar specialist Yingli Green Energy (NYSE: YGE) fell more than 11% on a sharp rise in average volume. Big Money selling may have been part of the problem, but a herky-jerky market obsessed with Europe's debt dilemma could have just as easily caused trouble.

So what: Solar stocks such as Suntech Power (NYSE: STP) and LDK Solar (NYSE: LDK) have a lot to lose if Europe turns tight-fisted in the wake of the Greek crisis. Germany, in particular, is a huge buyer of photovoltaic technology.

Now what: Expect to keep seeing days like this, right up until the fear and loathing that's gripped both European and worldwide markets finally subsides. Do you agree? Would you buy shares of Yingli Green Energy at current prices? Please weigh in using the comments box below.

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