Answer:
Part a)
It could start a price war since they are immediate contender and if HEB or Walmart build up a low-price technique the another organization would set up lower cost until the negligible expense can be up to out of line rivalry.
Part b)
In my supposition Walmart could win this value war since everyone realizes that Great Value is a Walmart brand and they have better control to this item. Additionally, to accomplish a lower cost than the brand name Walmart need to do a few dealings with its providers to be left at a lower cost to diminish the cost.