shadowstats is wrong according to their own numbers over the past two decades. If they were accurate since 2002, the dollar would have decreased in value much more dramatically (around 6% a year vs the official CPI around 2%). It's probably true that the CPI is understated but shadowstats is a provably worse methodology than the official CPI estimates.

I've heard this number referred to in a number of places, what is it, how it calculated, and where can I find it?