I can’t see my main grocery stores margin because they are private. Kroger’s margin is said to be 1.5% in the last decade and hasn’t gone up in the last couple years.

https://www.macrotrends.net/stocks/charts/KR/kroger/profit-m...

Actually Publix does very well at 7-8% and it’s the largest employee owned company in the US.

https://www.barrons.com/visual-stories/what-publix-can-teach...