There are many ways that inflation stats are under-stated, which is why many Americans are feeling the inflation pinch much greater than what's being reported. And perhaps why most Americans believe their wages aren't keeping up.
1) People are buying more generics
More than half (55%) of consumers bought more private label brands over the past year. CPI is calculated based on the prices paid for a good. So, if I'm a Chips Ahoy consumer last year, and the price of Chips Ahoy went from $3.50 to $3.75 a bag (7.1%), which caused me to switch and buy the same quantity of generic cookies at $3.60, then the CPI will only record a 2.9% increase. Consumer suffers but this isn't captured in the stats.
2) Moving down the quality spectrum
Similar to buying generics. Maybe instead of previously eating at fast casual (e.g. Smashburger), I'm now eating at McDonald's. Now using two-ply instead of three-ply. Ragu instead of Classico. Still spending the same so price paid for CPI "basket of goods" doesn't change, but less gratification.
3) Shrinkflation/Cheaper ingredients
You can't tell me that the CPI measurement is so sophisticated that it can measure this. But how many times have we seen our favorite brand of beverage now being sold for the same price, but now in a slightly smaller container? Or maybe now they sell an 8-pack of 8 oz soda (64 oz) vs. previously a 6-pack of 12 oz cans (72 oz) for the same price? Gatorade from 32 oz to 28 oz. Soups with less meat in them. Breads with fewer nuts and seeds on top.
These are all very real declines in customer experience that have made the inflationary effects of the past few years worse than the reported numbers suggest.
Inflation rates are supposed to account for all that stuff. I guess part of your argument is that they don't do so accurately and I don't really know about that but seems like you're just guessing
The CPI doesn't adjust for any of that stuff. It can't, and it's not designed to. Economic statistics aren't perfect.
When I used to teach this stuff, the examples that
@Stoneworker mentioned were things I would highlight for why the CPI actually
overstates the "true" rate of inflation. As he notes, for example, families can avoid some price increases by substituting generics for brand-name products, buying lower-quality items, etc. But he's right that while that dodges some of the price hikes, it still makes folks worse off since they're consuming second-best products. In other words, I would spin it a little differently, but neither of us are wrong. It's just a matter of how you frame it.
Regardless though, inflation is back to normal now. We should all be happy about that.