I think the K shaped economy she touches on is an interesting idea when it comes to inflation - the service sector, for instance, is not continuous in price, it is discrete - that is, when you look at pricing data you’ll often see two humps, one at the bottom end, one at the top end.
So - if the top hump skews off to the right, and the bottom hump stays put, it looks like inflation across the market, when it’s actually happening mostly at the top end.
Perhaps the pricing datasets need to be filtered and stratified, to present a CPI and a… I don’t know, a CPI+, with one looking at the actual general consumer market around median incomes, and one looking solely at the luxury/wealthy end of the market.
Dunno. Just seems like a poor basket of goods when there isn’t a uniform price distribution.