C-Town is a grocery chain in the northeastern U.S. that put most of its 200+ stores in lower-income areas. It could be that they never had enough competition to keep prices down, but now there are larger chains moving in that are charging 1/2 to 1/3 the same prices on products. Hard to understand how they will survive long-term. 

 They will either adjust or they won't. Thanks for additional info.
This is why competition is important.