The following video is from Wednesday's Investor Beat,  in which host Chris Hill and analysts Jason Moser and Bryan Hinmon dissect the hardest-hitting investing stories of the day.

For the past five years, Amazon.com has been quietly testing an online grocery delivery service in the greater Seattle area. Now come reports that Amazon is gearing up to expand the service to Los Angeles and San Francisco, with as many as 20 markets in 2014. In this installment of Investor Beat, Jason and Bryan discuss whether the service will pay off for investors or whether Amazon is making a mistake entering this space in the first place. Our analysts also look at four stocks that made big jumps or tumbles on Wednesday's market, and two stocks they'll be keeping their eye on over the coming week.

Bryan Hinmon, CFA, owns shares of and has long January 2015 $40 calls on Facebook. Chris Hill and Jason Moser own shares of Amazon.com. The Motley Fool recommends Amazon.com, Apple, Facebook, General Motors, RPX, and Tesla Motors and owns shares of Amazon.com, Apple, Facebook, Papa John's International, and Tesla Motors. Try any of our Foolish newsletter services free for 30 days. We Fools don't 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.