Canada’s year-on-year inflation rates broke lower in April with a strong decline in Canada’s CPIx that excludes eight volatile components from the CPI. The CPIx has lower volatility than the CPI headline (1.7%) but its volatility is higher than the core (1.4% vs. 1.1%).
Economists -including some central banker economists among them- have expended some effort in looking at inflation measures that exclude certain things beyond the traditional core omissions (food, energy…and, maybe, tobacco). The Dallas Fed in the U.S. has offered a trimmed mean; the Cleveland Fed has a damped measure as well. There are other efforts in the U.S. to exclude certain components such as housing costs linked to high mortgage rates (one of the items jettisoned by Canada’s CPIx as well); during COVID, there was the removal of surging truck prices in the U.S. gauge.
My view of these efforts is that I have a lot more respect for Canada putting out a price index that eliminates volatile items at all times, offering a structural parallax view of inflation, compared to the U.S. approach of eliminating items that are pushing up the rate of inflation the most. The traditional approach is to look at core inflation instead of headline inflation from time-to-time when commodity prices flare (food or energy particularly). This has been done to take the focus away from the part of the inflation process that is most volatile. However, when inflation is really rising, these components likely will be the most volatile part of the index. By definition, the most volatile components will surge the most when inflation rises. So, if inflation - when it gets going - always is stimulated through the same components, downplaying the structurally volatile items will lead to a misappraisal of inflation and of how it may be gathering momentum.
Canada’s indexes show that CPIx inflation is the lowest now (year-over-year), but it was traditional inflation (CPI) that rose the most. The question is whether CPIx will continue to lead the way lower.