The Value chain analysis for kroger super market retail industry is?

The Value chain analysis for kroger super market retail industry is? Compare firms in industries as close to one another as possible. Like an idea of Kroger as a retail store would not be comparable to Forever 21 maybe it would, since they have branched out into clothing. But Forever 21 only sells clothing to a certain age group, so Walmart, Target, and maybe Amazon would be comparable.