Different inflation measures can diverge up to 1%/year, so at 50 years, the choice matters a lot. Also, things like "core CPI" get redefined through the years (

Different inflation measures can diverge up to 1%/year, so at 50 years, the choice matters a lot. Also, things like "core CPI" get redefined through the years (in a way that almost always makes them lower) and other "hedonistic" adjustments are not universally accepted.