The following video is part of our "Motley Fool Conversations" series, in which consumer-goods analyst Isaac Pino and analyst Blake Bos discuss topics around the investing world.

Amazon.com began disrupting the retail world nearly 20 years ago, and ever since, traditional retailers have been trying to steal away its online market. Yet nearly all of the broadline retailers have been unsuccessful. Even Wal-Mart, the global leader in bricks-and-mortar retailing, has failed to gain traction online, with only 2% of its overall sales taking place on the Web.

Enter Wal-Mart To Go, a new same-day delivery service offering.

As a direct affront to Amazon, Wal-Mart will offer delivery of products purchased online to customers' homes on the same day for only a $10 shipping fee. Wal-Mart announced the program this week and is working closely with UPS to handle the logistics and distribute goods from supercenters. While rolled out on a regional scale, the program could be expanded nationwide in the near future.

Could this move change consumers' habits right before the holiday season? In today's video, Isaac and Blake discuss same-day delivery and one more upcoming Wal-Mart announcement that's sure to rattle the nerves of grocery store competitors.

Everyone knows Amazon is the big bad wolf in the retail world right now, but at its sky-high valuation, most investors are worried it's Amazon's share price that will get knocked down instead of those of the competitors. We'll tell you what's driving Amazon's growth, and how to know when to buy and sell this company today, in our new premium report. Our report also has you covered with a full year of free analyst updates to keep you informed as Amazon's story changes, so click here now to read more.