Walmart blackmailing labels over price?

Apple isn’t the only company who can boss around labels with pricing.  Walmart has been doing a pretty good job of it too and they keep proving it.  Lately, they’ve been telling the labels that they have to adjust their pricing downward to keep the shopping-behemoth happy.  WM also told the movie studios that they better not get too excited about offering music downloads ‘cause they’ll start yanking their DVD’s off the shelves in their stores.  Should WM be able to push around all parts of the entertainment industry?  They can as long as they remain the biggest seller of their product in their stores (Apple is catching up in sales though).  Makes you wonder what else WM is going to decide that the entertainment industry is going to do next.