RadioShack shares down sharply on weak outlook

When RadioShack announced late Monday that it didn't earn nearly as much as expected in last year's fourth quarter (and that 2012 wasn't looking so hot, either), investors pummeled the electronics retailer's shares in after-hours trading. And with additional time overnight to ponder the Fort Worth-based company's disclosure, investors pounded the stock (ticker: RSH) even worse when regular trading opened today. The shares were down nearly 30 percent by late morning.

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-- Jim Fuquay