Summary (and Extension!) of My Post-CPI Tweets

By: Michael Ashton | Thu, Feb 26, 2015
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Below you can find a recap and extension of my post-CPI tweets. You can follow me @inflation_guy or sign up for email updates to my occasional articles here. Investors with interests in this area be sure to stop by Enduring Investments.

What a busy and interesting CPI day. For some months, the inflation figures have been confounding as core inflation (as always, we ignore headline inflation when we are looking at trends) has consistently stayed far away from better measures of the central tendency of inflation. The chart below (source: Bloomberg), some version of which I have run quite a bit in the past, illustrates the difference between median CPI (on top), core CPI (in the middle), and core PCE (the Fed's favorite, on the bottom).

Larger Image

I often say that median is a "better measure of central tendency," but I haven't ever illustrated graphically why that's the case. The following chart (source: Enduring Investments) isn't exactly correct, but I have removed all of the food and beverages group and the main places that energy appears (motor fuel, household energy). We are left with about 70% of the index, about a third of which sports year-on-year changes of between 2.5% and 3.0%. Do you see the long tail to the left? That is the cause of the difference between core and median. About 12% of CPI, or about one-sixth of core, is deflating. And, since core is an average, that brings the average down a lot. Do you want to guide monetary policy on the basis of that 12%, or rather by the middle of the distribution? That's not a trick question, unless you are a member of the FOMC.

Weight of CPI base components by y/y changes

Now, let's talk about the dollar a bit, since in my tweets I mentioned apparel and autos. Ordinarily, the connection between the dollar and inflation is very weak, and very lagged. Only for terribly large movements in the dollar would you expect to see much movement in core inflation. This is partly because the US is still a relatively closed economy compared to many other smaller economies. The recent meme that the dollar's modest rally to this point would impress core deflation on us is just so much nonsense.

However, there are components that are sensitive to the dollar. Apparel is chief among them, mainly because very little of the apparel that we consume is actually produced in the US. It's a very clean category in that sense. Also, we import a lot of autos from both Europe and Asia, and they compete heavily with domestic auto manufacturers. As a consequence, the connection between these categories and the dollar is much better. The chart below shows a (strange) index of New Cars + Apparel, compared to the 2-year change in the broad trade-weighted dollar, lagged by 1 year - which essentially means that the dollar change is 'centered' on the change in New Cars + Apparel in such a way that it is really a 6-month lag between the dollar and these items.

cpi new cars and apparel

It's not a day-trading model, but it helps explain why these categories are seeing weakness and probably will see weakness for a while longer. And guess what: those categories account for around 7% of the "tail" in that chart above. Ergo, core will likely stay below median for a while, although I think both will resume upward movement soon.

One of the reasons I believe the upward movement will continue soon is that housing continues to be pulled higher. The chart below (source: Enduring Investments using Bloomberg data) shows a coarse way of relating various housing price indicators to the owners' rent component of CPI.

various housing price indicators compared to owners' rent component of CPI

We have a more-elegant model, but this makes the point sufficiently: OER is still below where it ought to be given the movement in housing prices. And shelter is a big part of the core CPI. If shelter prices keep accelerating, it is very hard for core (and median) inflation to decline very much.

One final chart (source Enduring Investments), relating to my comment that our inflation angst index has just popped higher.

Inflation angst index higher

This index is driven mainly by two things: the volatility of the various price changes we experience, and the dispersion of the price changes we experience. The distribution-of-price-changes chart above shows the large dispersion, which actually increased this month. Cognitively, we tend to overlook "good" price changes (declines, or smaller advances) and recall more easily the "bad", "painful" price changes. Also, we tend to encode rapid up-and-down changes in prices as inflation, even if prices aren't actually going anywhere much. I reference my original paper on the subject above, which explains the use of the lambda. What is interesting is the possibility that the extremely low levels of inflation concern that we have seen over the last couple of years may be changing. If it does, then wage pressures will tend to follow price pressures more quickly than they might otherwise.

Thanks for all the reads and follows today. I welcome all feedback!


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Michael Ashton

Author: Michael Ashton

Michael Ashton, CFA

Michael Ashton

Michael Ashton is Managing Principal at Enduring Investments LLC, a specialty consulting and investment management boutique that offers focused inflation-market expertise. He may be contacted through that site. He is on Twitter at @inflation_guy

Prior to founding Enduring Investments, Mr. Ashton worked as a trader, strategist, and salesman during a 20-year Wall Street career that included tours of duty at Deutsche Bank, Bankers Trust, Barclays Capital, and J.P. Morgan.

Since 2003 he has played an integral role in developing the U.S. inflation derivatives markets and is widely viewed as a premier subject matter expert on inflation products and inflation trading. While at Barclays, he traded the first interbank U.S. CPI swaps. He was primarily responsible for the creation of the CPI Futures contract that the Chicago Mercantile Exchange listed in February 2004 and was the lead market maker for that contract. Mr. Ashton has written extensively about the use of inflation-indexed products for hedging real exposures, including papers and book chapters on "Inflation and Commodities," "The Real-Feel Inflation Rate," "Hedging Post-Retirement Medical Liabilities," and "Liability-Driven Investment For Individuals." He frequently speaks in front of professional and retail audiences, both large and small. He runs the Inflation-Indexed Investing Association.

For many years, Mr. Ashton has written frequent market commentary, sometimes for client distribution and more recently for wider public dissemination. Mr. Ashton received a Bachelor of Arts degree in Economics from Trinity University in 1990 and was awarded his CFA charter in 2001.

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