August 19, 2022

“Transitory” No Longer: Double-Digit Inflation Is Here!

Presenting the inflation rate as a year-over-year calculation obscures shorter-term but substantial fluctuations that may occur and what they will portend for the future, especially if inflationary expectations are beginning to become unhinged.

The Bureau of Labor Statistics (BLS) and the media  reported   the pumpiing rate— that is, the  Consumer Price Index ‘ s rate associated with increase— to be 1 . three or more percent for June 2022 and 9. 1 percent 12 months over year (for the final twelve months).

This shocked  markets and investors because economists’  median prediction   had been 1 ) 1 percent for June and 8. 8 percent yr over year. This surprise would have been much higher, however , had the yearly inflation rate been documented as the CPI’s compounded annual rate of change for your month or quarter. This calculation method would have revealed the stark reality that double-digit inflation is not just a specter looming on the horizon but  is here  today . According to computations I made using the interactive  economic data website   (FRED) of the Government Reserve Bank of St Louis (FRB of St Louis), the annualized pumpiing rate for June 2022 was 17. 1 percent, while  for the second quarter of 2022, the rate was ten. 5 percent.

Allow us to compare these two methods of determining the annual inflation rate using the figures in the preceding paragraph.   Based on the BLS , CPI changes are “ a measure of the average change over time in the prices paid by city consumers for a market container of consumer goods and services. ” To say that the monthly pumpiing rate is 1 . 3 or more percent, then, means that the CPI increased by 1 . 3 percent from the 30 days before. Similarly, a year-over-year inflation rate of 9. 1 percent means that the CPI rose by 9. 1 percent over the past twelve months. This way of calculating the annual inflation rate is backward searching, because the most recent monthly price is heavily outweighed with the previous eleven months’ rates.

In contrast, determining the annual inflation price by compounding and annualizing the most recent monthly or quarterly rate of change within the CPI gives a better idea of what inflation currently can be and how it may be trending. For example, the 17. 1 percent exponentially boosted annual inflation rate reported above is derived by assuming that the 1 . 3 % monthly rate of change for June continues unchanged for the next eleven  a few months. If the monthly inflation rates appear to be volatile, the compounded annual inflation rate the past three months may also be computed in a similar manner. As noted above, the compounded annual inflation rate for April 2020 to June 2022 was 10. 5 percent. In any case, this computation method is forward looking and much more useful for analyzing the effects of fresh inflation data and recent events’ likely impact on the inflation craze.

Now this might seem like merely a technical issue, but some forms of data demonstration are clearer and more helpful than others, especially throughout a time of rapid inflation. Introducing the inflation rate like a year-over-year calculation obscures shorter-term but substantial fluctuations that may occur and what they portend for the future, especially if inflationary targets are beginning to become unhinged. Moreover, presenting inflation data within annualized form permits crystal clear and easy comparison of pumpiing rates in periods associated with varying length. For example , until January 1997, the FRB of St . Louis, which usually for many years was the most “ monetarist” and inflation aware of the regional FRBs, displayed inflation rates with “ growth triangle” in its monthly release (suspended in March 2015),   Nationwide Economic Trends   ( NET ). The triangle, which usually resembles an intercity usage table on a highway chart, consisted of compounded annual inflation rates  for each of the 19 immediately preceding months and for all series of consecutive several weeks in that range, totaling 190 rates in all.

For example , at the height from the Great Inflation, the  February 1980   issue of  NET   (p. 4) showed that the annualized inflation rate for January 1980 had spiked to 18. 6 percent from 15. 7 percent the previous month, through 13. 7 percent for the fourth quarter of lates 1970s, and from 11. 7 percent for January lates 1970s. This pattern, in conjunction with cash supply data, indicated that inflationary expectations were beginning to become unmoored from financial fundamentals. However , this was not really nearly as evident in the year-over-year calculations. The year-over-year inflation rate for The month of january 1980 crept up to thirteen. 8 percent from thirteen. 0 percent the previous month and from 11. 3 or more percent in July lates 1970s, six months earlier.  

The FRB of St . Louis altered the method of presenting the inflation rate in the 1990s, but it is not exactly clear precisely why. In  August 1991 ,   INTERNET   (p. 2), without comment, added a double line graph exhibiting year-over-year changes in both the particular CPI for all items and the CPI for all items much less food and energy (“ the core inflation rate” ). The growth triangle showing compounded annual rates has been retained but relegated to some lower position on the web page. In  January 1997 ,   NET   (pp. one, 8– 9) readers had been warned that “ they might be startled when they open this issue” for they will find it “ has been redesigned through the ground up. ” Among the changes was that “ Development triangles are now gone and charts now dominate. ” The inflation rate was now reported by the double line graph tracking  year-over-year   changes in the CPI and CPI much less food and energy, as well as a hybrid line/bar graph reporting  monthly   changes in the two CPIs.

Gone was any presentation of compounded annual inflation rates, which facilitated the grasp of the inflation rate’s  latest monthly or quarterly fluctuations and its trend in the intermediate run (12– eighteen months). The FRB of St . Louis evidently recognizes that many visitors to its site still consider compounded yearly rates of change an essential tool for organizing and displaying data. Its online FRED website permits simple calculation of compounded yearly inflation rates. It also features downloadable  spreadsheet growth rate macros : “ These following macros are provided by the Federal Reserve Financial institution of St . Louis so that users can generate their own triangle tables to show exponentially boosted annual rates of change. ”

Like a footnote, about a year back, supply-side economist Alan Reynolds published an  write-up   in which this individual argued  “ year-to-year changes in the CPI … can deceived about both recent information and trends” but appeared resistant to the idea of computing plus monitoring compounded annual pumpiing rates. He recommended rather what he believed to be the “ more timely and less bewildering alternative [of] simply keep track of[ing] monthly adjustments over several months. ” But surely, merely converting month-to-month or quarterly rates in order to compounded annual rates will not distort or obfuscate the data and makes it easier to visualize inflationary trends over advanced periods.


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