I don’t profess to have the answer to this, but I wouldn’t look to Bernie for answers. So completely forget what Bernie says. The capitalist in me says competition is good. It creates lower prices, wider variety and better quality. On the other hand, there is such a thing as economies of scale. That can reduce prices if there still completion. If there is no competition, economies of scale solely increases profits.
They can also artificially lower prices in certain areas, destroy local mom and pop stores, and after those close they raise prices.
They also keep employees 1 hour under full time so they don’t receive benefits, and they sell ChiCom trash.