I mean, it could be still true if you expect that only the economy outlier super rich driving up the costs against those that can barely scrape together enough

I mean, it could be still true if you expect that only the economy outlier super rich driving up the costs against those that can barely scrape together enough for a meal. An interesting observation would be to know the grocery cost growth per area / supermarket chain to see if there's a wider increase in prices between affluent and poor neighbourhoods.