With its stock sagging and its auctions business slowing, eBay (Nasdaq: EBAY) plans to put more emphasis on its fixed-price business. Can eBay take a bite out of Amazon.com (Nasdaq: AMZN) and compete on price in a world of Costcos (Nasdaq: COST) and Wal-Marts (NYSE: WMT)? Does Facebook's social network pose a serious business threat to eBay? In this installment of "Fool Video," Motley Fool contributor Tim Beyers gives his take.

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Amazon, Costco, and eBay are Motley Fool Stock Advisor recommendations. Wal-Mart is a Motley Fool Inside Value recommendation. Get the scoop with a free 30-day trial subscription offer.

Neither Lou nor Tim own shares of any of the stocks discussed. Mac owns shares of Costco and eBay. The Motley Fool has a disclosure policy.