Big-box stores may see dark days ahead
Walmart (WMT) and Target (TGT) gained dominance by offering everything from groceries to children's toys, often putting smaller, local stores out of business in the process. Now, it's the revenge of the smaller retailers. Walmart is being forced to focus on "defensive investments" as it seeks to counter the popularity of online retailers such as Amazon (AMZN), as well as smaller chains such as dollar stores and drugstores. That's according to a new report from Goldman Sachs (GS), which downgraded its investment rating on the retail giant. More from CBS News .