Hard to tell... Maybe the cheaper store bought too much and needs to get rid of it before the expiration date? Maybe the more expensive store didn't order enough and doesn't want to run out? Some stores use the shopper card data to know what sells with what. Maybe they advertise the cheap cream cheese so that people come in and buy salsa and Doritos? Maybe they leave these other items at a higher price? 

 Just know the local corner stores always are charging more cause it cost those stores more.  

 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.