Economics

Quick Hit: Reopening Drove Up April’s Prices

Under the hood, April’s US Consumer Price Index was far cooler than the headline read.

Almost a week after the report hit, April’s US Consumer Price Index (CPI) reading is still garnering tons of attention—and stoking lots of fear in the process. We have spilled many pixels on this already, arguably too many, and we don’t intend to belabor the point here. However, one aspect that we think is going underreported is just how much skew reopening drove. Here is a quick look under the hood that reveals this quite clearly.

First, to be clear, we aren’t referring to the 4.2% y/y inflation rate.[i] That, as we noted recently, was a garbage number—hopelessly skewed by the depressed April 2020 reading that serves as the denominator. Rather, we are referring to the 0.8% m/m rise—the largest since June 2009.[ii] Actually, without rounding, that figure was 0.77%.

Underneath that headline number, there are a couple hundred or so subcategories. Five of them—used cars, car and truck rental, airline fares, admissions (to the movies and sports events) and lodging away from home (hotels/motels)—accounted for 0.448 percentage point of April’s monthly increase. These five categories, which account for 5.061% of the overall CPI basket, accounted for more than half the monthly gain. Exhibit 1 shows you this visually, if you are that kind of learner.

Exhibit 1: Reopening Drives CPI Higher


Source: US Bureau of Labor Statistics, as of 5/14/2021.

For four of the five, the connection to reopening is quite obvious. The one exception is used car and truck prices, which rose 10.0% m/m and added 0.272 percentage point to the headline rise, the biggest contributing subcategory by far. Some pundits, like Matthew Klein at Barron’s and Paul Krugman in The New York Times, came up with plausible-seeming explanations. The former tied it mostly to car rental companies liquidating their fleets a year ago—and scrambling to rebuild them now. The latter mostly pinned it on semiconductor shortages impacting new vehicle production. Whichever of these are right—or even if both are wrong and some other cause or causes explains the jump—we strongly doubt used car prices will continue rising at April’s white-hot rate.

The same holds for the more obviously reopening-related areas. It all adds up to a report that actually illustrates the likely fleeting nature of recently rising inflation measures, despite all the hullabaloo it drove. To us, that suggests investors reacting to fearful headlines could easily be committing an error.



[i] Source: US Bureau of Labor Statistics, as of 5/17/2021.

[ii] Ibid.

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