Amazon is a large and powerful company that dominates the world of  online selling. Walmart is a large and powerful company that dominates  the world of bricks & mortar selling. 

These two firms are starting  to come into conflict when it comes to next-day home delivery as Walmart starts to move into online sales and Amazon starts to move into home delivery.  

The product managers at Amazon are going to have to sharpen their  skills and review their product development definition in order to go  into battle with the product managers at Walmart.