Internal documents show Amazon is reshaping its retail infrastructure to compete head-on with Walmart's Supercenter model.

Walmart has long been a provider of groceries, and the retailer began selling groceries back in 1988 with the opening of its ...

With the high prices of groceries, it makes sense that shoppers look for the most affordable option. Some may turn to big box stores, while others check out discount grocers like Aldi and Walmart. But ...