For the official US inflation calculation, this is probably in BLS series CUSR0000SEFT01 (Soups in U.S. city average, all urban consumers, seasonally adjusted)

For the official US inflation calculation, this is probably in BLS series CUSR0000SEFT01 (Soups in U.S. city average, all urban consumers, seasonally adjusted). You can get the data (starting from 1978) here: https://beta.bls.gov/dataViewer/view/timeseries/CUSR0000SEFT01 https://beta.bls.gov/dataViewer/view/timeseries/CUSR0000SEFT... Using BLS numbers, you get a price increase of 346% (=246/71) from Jan 1978 through Jan 2020. If we eyeball the graph from the blog, we're looking at a price increase from $0.19 or $0.20 to $0.85, which is 425% or 447% (starting at $0.19 or $0.20 makes a big difference). Looking closely at the dots of raw data, it looks like most of the recent ads clusterred around the $0.69, $0.79, $0.89 or $1.00 level. If you buy it at the $0.69 level, you're almost exactly at the BLS 346% level, whereas at $1 you're looking at 500%. On wallmart.com, it seems you can buy it currently at between $0.98, $0.87 (4-pack) or $0.415 (12-pack) per can: https://www.walmart.com/ip/Campbell-s-Condensed-Tomato-Soup-10-75-Ounce-Can/10321636 https://www.walmart.com/ip/Campbell-s-Condensed-Tomato-Soup-... https://www.walmart.com/ip/4-Pack-Campbell-s-Condensed-Tomato-Soup-10-75-Ounce-Can/43346748 https://www.walmart.com/ip/4-Pack-Campbell-s-Condensed-Tomat... https://www.walmart.com/ip/Campbell-s-Condensed-Tomato-Soup-10-75-oz-12-Ct/375787161 https://www.walmart.com/ip/Campbell-s-Condensed-Tomato-Soup-...