Retail spending was up 3.9% in October, which should be a good sign for retailers heading into the holiday season. But Wal-Mart (NYSE:WMT), Target (NYSE:TGT), and Best Buy (NYSE:BBY) are either growing more slowly than the overall market or even seeing store sales decline. 

The reason for the brick-and-mortar weakness may be none other than Amazon.com (NASDAQ:AMZN), which will soon pass Target in sales. Every percentage point of growth Amazon gains has to come from somewhere, and it looks like it's coming from Wal-Mart, Target, and Amazon. 

Erin Miller sat down with the Fool's Travis Hoium to see how investors should react. 

Fool contributor Travis Hoium is short shares of Amazon.com. The Motley Fool recommends and owns shares of Amazon.com. 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.