Wal-Mart's market share in the retail sector today is a fraction of the market share of the Great Atlantic & Pacific Tea Company (also known as A&P supermarkets) at the height of its domination -- and that company has been a story of almost constant decline since World War II.
Walmart is not a monopoly. Walmart is an unintentional beast eating small town America. I don't shop Walmart because locally they stay full of customers because you can not buy and get out. I don't stand in lines since I got out of the military in the 70's. A&P was more regionally a threat and hardly ever put a corner store out of business. The other chains did that and put A&P out of business too with predatory pricing.
My feelings are when you buy the lowest price for the same product, fine. When you buy the cheap product ??????