I have been wanting to do something similar to this for years now, in terms of long-term price appreciation against inflation and shrinkflation. Unfortunately,

I have been wanting to do something similar to this for years now, in terms of long-term price appreciation against inflation and shrinkflation. Unfortunately, this would have required product data and in-store price data going back decades. And done likely against the wishes of grocery chains, which would have required volunteers to go in and surreptitiously record prices across the country, not something easily doable without a modern smartphone.