Earlier quoted context omitted.
> If milk is $4/gallon today and still $4/gallon 12 mos. from now, that's 0% YoY inflation. Conversely, if there was a one-time jump in a particular item, it will take a year before it gets 'removed' from the inflation numbers. Extremely contrived example: if gas/petrol was $1/L in December 2021 (and generally in all of 2021), but $1.20/L in January 2022, then there will be a 20% YoY jump in inflation for the January…
It’s not really skewing anything though, since the price is 20% yoy?
The price is still 20% you, and still 0% mom. If reported as inflation still at 20%, does that affect perceptions of inflation, and if so, expectations of inflation? Because expectations of inflation often turn out to be self fulfilling drivers of inflation.
Reported as inflation stable even if it is 20%? Better? Not that 0% is a great target, but that's a separate issue.