But they all shop at Walmart.

I'm not 100% sure what this has to do with business ownership.

It means there is no local supermarkets, just one large monopoly.

Except there are still lots of local contractors, plumbers, specialty stores, etc. I don't disagree that Walmart has toxic effects, buy to say that it means there is no local business anymore is a stretch in my view.

But they operate on extremely low wages supplemented by government transfer payments.

I imagine many would say that's due to the inflationary pressure of living in a country with wealthy coastlines.