I don’t know the answer but it could be several things. Some supermarkets may have been able to lower operating costs. How? Maybe layoffs, negotiating buying larger quantities, selling more white label vs brand items, etc. If someone knows the actual answer it would be good to know.

They have higher revenue but the same profit margins. We’d expect their revenue to increase as the value of the dollar decreases - it takes more money to buy the same amount of stuff. If they were gouging then their profit margins would vastly increase. They don’t. That’s the point.