Runaway Inflation - A Pin For Stock Market Bubble | ETF Trends

By Roman Chuyan, CFA, Model Capital Management LLC

  • Today’s consumer price inflation numbers were staggeringly high.
  • High inflation will likely be followed by rising market interest rates (yields).
  • I speculate once again why I think this will prove to be the proverbial pin to prick this bubble.

The stocks market rally since April-2020 took it to an extreme valuation. It’s a bubble, pure and simple, as I’ve been writing since February. Reason doesn’t apply to bubbles – instead, they are sustained by crowd mentality. Still, all bubbles burst – the bigger the bubble, the more severe the crash. This bubble in stocks (and in bonds, real estate, etc.) is very big, in no small part due to the Fed’s policies. By most measures, the market valuation is at its highest in at least 150 years, as I detailed in my recent articles (see here and here). Once again, the Shiller’s P/E ratio, which controls for earnings cyclicality, is at its highest in at least 150 years (other than the dot-com bubble in 1999-2000):

But, when will the bubble burst? Timing is hard to determine in advance, and a burst needs a catalyst. We began pointing to rising inflation and market interest rates (yields) since March as potential catalyst, and it became clear by early May that inflation was poised to jump. Finally, in my Monday’s article I expected inflation to jump substantially as soon as this week (May 12th).

In today’s update, I review the latest inflation numbers, and speculate once again why I think it will prove to be the proverbial pin to prick this bubble. It’s still early to talk about how much downside is expected – once it’s clear that the bubble has burst, it will be the topic for future articles – stay tuned. I will also mostly leave out the reasons why we think inflation is rising.

First, let us note an important relationship that predicates my argument – one between inflation (and inflation expectations) and market yields (say, the 10-year Treasury yield). Such relationship held, albeit somewhat loosely, since Treasury yields were floated in the early 1960’s. Most of the time (but not now), the yield exceeds inflation, to compensate investors:

Source: Ycharts, shaded are recessions.

It is plausible that the Fed’s new (since 2008) bond-buying habit forces yields to stay well below inflation. However, this is a double-edged sword because the Fed buying bonds amounts to money-creation, which will likely drive inflation even higher. This possibility aside, we assume that yields will rise from here and follow inflation higher.

Rising yields will be the proverbial pin. Higher yields have historically had a negative effect on the stock market. Market volatility has already increased this week, and I think stock investors are rightfully concerned. Recall that stocks began to drop the moment the 10-year Treasury yield rose above 3.2% in October of 2018 (see chart below). The concern was, and remains, that higher rates would burden the financial system due to enormous debt. This time, the “too-high” yield level will likely be lower, because there’s even more debt and we’ve been conditioned by near-zero rates in 2020-21. What’s that critical level? My guess is as good as yours, but I’d put at the round number of 2% on the 10-year Treasury. The 10-year is currently trading just below 1.7%.

Source: Ycharts

The consumer price index (CPI) numbers for April reported this morning were staggeringly high in the context of low inflation in recent years. The CPI rate jumped to 4.2% well above 3.6% expected, and the highest rate in 12.5 years, since 2008. Core CPI which excludes food and energy jumped to 3%, also well above expectations and its highest since 1996 (24 years):


Keep in mind that the earlier consensus expectations (3.6% for CPI) already reflected the “base effect,” or the “transitory” nature of inflation that the Fed officials have recently quoted. So, this jump in inflation was unexpected, and non-transitory (permanent).

I will only briefly mention the reasons for this jump in inflation. At a high level, it’s caused by reduced supply of goods (raw materials, computer chips, etc.) coupled with rising demand for them. The government’s policies have created both. The current administration’s restrict-and-regulate policies cause reduced production. The generous federal stimulus payments caused several million people to leave the labor force, which created labor shortages and reduced production. On the demand side, the trillions in these payments kept demand for goods high (think of the housing boom, for example). A result – self-reinforcing shortages and price increases.

Raw material prices experienced a huge jump in the past 12 months: the CRB Commodity Index is up 70%, and the CRB Non-Energy index is up 50%. Below are some 10-year charts that illustrate the magnitude of the commodity rally. Lumber is the most extreme, with its price now 3-5 times the highest levels seen in 40 years of available history. Most other commodities – for example industrial metals (copper, iron) and foodstuffs (soybeans, wheat, pork) – rose sharply in the past year to 10-year or all-time highs.



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