In southern Norway, a lot of small farms and these farms are small shops that sell what is grown and produced on the farm. Here you can buy fresh eggs, preserves and jams, vegetables, potatoes and knitwear for children. And in these wonderful stores no sellers.
In one corner is a calculator on which the customer finds what he needs to pay, and the box where you put your money and supplies.
All works on complete trust and honesty. There is nothing stopping you just take and go, but no one does. Picked vegetables, hard, count how many must put money and take delivery. And that’s fine.