eBay could be taking on the 800-lb. gorilla in the room, Amazon, with its new same-day shipping strategy. Where eBay and bricks-and-mortar stores have generally played second fiddle to Amazon's huge growth story, together they may be a more powerful force and could quickly grow to become a more competitive player in the online retail space. eBay's same-day shipping could be the key to the puzzle. Its partnerships with a few San Francisco bricks-and-mortar retailers allows it to serve an unmet online retail need, without the same inventory management logistics that Amazon has to worry about.

Even despite the headwinds, though, Amazon remains a Foolish favorite, and one of the companies we named in our premium report: "3 Stocks That Will Help You Retire Rich." Click here to keep reading and start down the road of long-term wealth-building.

Austin Smith owns shares of eBay. The Motley Fool owns shares of Amazon.com, Best Buy, and RadioShack. Motley Fool newsletter services recommend Amazon.com and eBay. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.