https://www.macrotrends.net/stocks/charts/WMT/walmart/net-pr...
https://www.macrotrends.net/stocks/charts/KR/kroger/profit-m...
https://www.macrotrends.net/stocks/charts/COST/costco/profit...
https://www.macrotrends.net/stocks/charts/ACI/albertsons/pro...
https://www.aholddelhaize.com/en/investors/quarterly-results...
The answer is that retail grocery business is highly competitive, and that price increases at retail grocery is because their costs are increasing (food vendors, labor, land, etc).