Organic food is already becoming cheaper due to it being available even at low end grocery stores. Whole Food's margins have been falling for years due to this

Organic food is already becoming cheaper due to it being available even at low end grocery stores. Whole Food's margins have been falling for years due to this fact. What I find interesting is that Amazon intentionally keeps their operating margins at 4%. This is a reason they are very hard to compete with. What I find interesting about the grocery purchase, is that most grocery stores have very small margins already, and I wonder how much this signals the beginning of Amazon buying into lots of other low margin businesses.