Regarding the comments about potatoes and eggs: These were just two examples of products that are cheaper regionally. Of course, there are also other products that are cheaper or cost the same and from which delicious dishes can be prepared =)
That's typical nowadays. You name a few examples and some people immediately say they don't want to live on just that :D.
At our farm shop, hardly anything is more expensive than in the supermarket. However, some things are only available seasonally. A lot of products come from within a radius of only about 10 kilometers. That naturally eliminates various middlemen.
I know two hairdressers. Both of them can easily pay for their monthly groceries with their tips. And a hairdresser who doesn't cut hair on the side is rather rare ;).
Neither of them has complained about their monthly income so far.