I agree with your math, we were not on the same page. So prices in 10 years went up 30.7% according to BLS and if they were off 3% per year prices went up 74.1%. That does seem exessive doesn't it? It's hard to remember prices 10 year ago, some things did go up 74%, but probably not on average. I am sure my health insurance went up more than 74%, gas more than 74%, the price of a house (I know that doesn't count) more than 74%, but not everything, ok, I'll buy that. Let's say that inflation might be under-reported 1.5% now, can you go there? It still makes TIPS 25% overpriced and puts GDP below zero.
BTW, so ShadowStatistics isn't calculating inflation like it was done before 1990? Do you have solid proof for that? I understand the geometrics, but he could be eliminating the chicken verses steak substitution (or value added adjustments) going on, I do not see how geometrics handles that.
Edit: I missed cute fuzzy bunny's comments, she/he/it says her/his/it's father lost 30% purchasing power in 15 years after getting his SS which was adjusted to inflation. That seems to confirm the 3% I was talking about. Maybe I should have said it could be off about 2% or 2.25%, how about that?