It may seem like I’ve been obsessed with inflation recently. But so has everyone else, and it’s an important issue for long-term investors for reasons I’ve previously detailed. So, it’s worth noting that the Bureau of Labor Statistics (BLS) recently issued its August Consumer Price Index (CPI) inflation data.
Here’s a typical headline about the new data from the venerable New York Times:
- “Price Pressures Remain Stubbornly High”.
And the fear of stubbornly high inflation caused the S&P 500 to slump 4.3% on September 14th, the day after the August inflation data came out. This headline from Yahoo! sums it up:
- “Stocks Tank After Higher-Than-Expected CPI Report”.
On the surface, both of these headlines are accurate, but they miss a big part of the story. The best analogy I can think of would be a story where a fireman bravely saves several children from a roaring house fire. Yet the next day the local headline reads, “Fireman Stubs Toe During Alarm Call”. In other words, there is some good news contained in the most recent inflation numbers.
Inflation Is Falling, Not Rising
In a July post, I noted that each month’s new headline inflation number adds the most recent month’s inflation data to the prior 11 months of data to create an annual inflation number.¹ That is, the August headline inflation value of 8.3% represents the overall inflation observed from September 2021 through August 2022. But only the most recent month’s value represents anything new. We’ve known the bulk of what’s contributing to the August 8.3% inflation value for many months.
When I’m looking for recent trends in inflation data, I find it much more helpful to focus on month-by-month inflation data. Here’s a graph showing the 1-month change in inflation over the past couple of years.
The monthly data paint a different picture. The 1-month change in CPI in August of 0.1% was the lowest reading over the last 22 months, with the only exception being the most recent July number. In other words, the last two months strongly suggest that inflation is abating dramatically from June’s extremely high number of 1.3%.²
Of course, two months of data don’t constitute a long-term trend. Inflation could spike again next month; no one knows for sure. But to imply that the recent inflation numbers are adding inflation pressure is misleading. The only way that the August 12-month inflation value of 8.3% could be substantially lower was if significant deflation had occurred in August, which means that prices would have to be decreasing in multiple categories of goods and services.
So Why Are The Headlines So Bad?
The reason for the dismal inflation headlines is summed up in a brief article from CNN. Among other things, the article points out that:
- “The [index] rose 0.1% from July, versus economists’ projections of a 0.1% drop.” (my emphasis added)
In other words, everyone was hoping that there would be 0.1% monthly deflation, but we got that amount of inflation instead.
However, the BLS reports its margin of error as 0.06% on these monthly changes. So, the August number could be as low as 0.04%, which becomes zero if we round to the significant digits that BLS reports. And given that the August projections were attempts at predicting the future, they likely carry with them a much higher margin of error. Based on my 35 years of experience with both projections and data analysis, I would argue that there is likely no statistical difference between the August projection and the actual result reported by BLS.
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