Shadowstats's 80s-based measure says we've been having 10% YoY inflation for two decades now. If that were true, prices would've 5x'ed since the year 2000. That doesn't pass the 'sniff test' to me; e.g. the Big Mac Index [1] says a Big Mac cost $2.50 in 2000 and $5.50 today, equivalent to about 4% YoY inflation.

[1] https://www.economist.com/big-mac-index

The same shadowstats just takes BLS CPI and adds a constant to it? https://news.ycombinator.com/item?id=27124745