The retail world is abuzz with talk of cheap lightbulbs. That's right, lightbulbs. Wal-Mart (NYSE: WMT ) has announced that relatively affordable LED lightbulbs will be available for sale for the first time exclusively at Wal-Mart stores and Walmart.com. Should investors care about something as trivial as a lightbulb? Absolutely. In this video, Fool.com contributor Aimee Duffy explains why.
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