[pmmucsd]

That's exactly what they do. They buy products from suppliers and mark them up, sell the the products and take the margin.

[adam_arthur]

Except the markup and margins are extremely low because the grocery business is competitive.

Unlike the app store space (within a given device)

[pixl97]

https://smallbusiness.chron.com/profit-margin-supermarket-22...

That is profit margins in a competitive market.