Wednesday, March 5, 2025

Is the super bubble in US stocks about to pop?

The Trump administration's early actions have been long on policy measures seen as stoking inflation and curbing growth, without the offsett
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The Trump administration's early actions have been long on policy measures seen as stoking inflation and curbing growth, without the offsetting tax relief as of yet. This has a lot of people raising alarms about recession and market risks. For his part, President Trump told Congress last night, "There'll be a little disturbance, but we're OK with that. It won't be much." Should we believe him though?

It's with those thoughts in mind that I listened to my UK-based colleague Merryn Somerset Webb's interview with famed value investor Jeremy Grantham. The takeaway from that conversation was this resulting headline: "Jeremy Grantham Warns US Stocks Are About to Be Crushed," a very different outlook than the one predicted by the US president.

Let's tackle this from the standpoint of what I'd call a super bubble deflating. I define a super bubble as an inflation-adjusted rise in the stock market of 200% over any 10-year period. That equates to a gain of more than 11% annually in excess of inflation for an entire decade, something we've only witnessed a handful of times.

One might think, given the continued frothiness of markets, that we're in the middle of such an occurrence right now. But by my definition, the latest super bubble actually ended several years ago. So it's not so much Trump's policies popping a bubble as much as it is unsustainable valuations coming back down to earth.

  1. The apogee of this super bubble was in 2019 when the S&P 500 had gained 218% in excess of inflation over the prior decade and the Dow Jones had gained 208%.
  2. Pandemic stimulus allowed this super bubble to partially reinflate, but neither during the pandemic nor during the recent AI rally were decade-long gains for the broader market as spectacular as they had been in 2019. Those long-term gains right now are about half what they were six years ago.
  3. A fiscal retrenchment or re-ignition of inflation could be near-term triggers for accelerating the decline.
  4. As with all super bubbles, the unrealistic valuation metrics have remained inflated on the way down. These will give way during recessions when earnings are also falling, meaning, yes, the next downturn will be very difficult for equities.

The bull market hasn't prevented long-term gains from diminishing

Let's start with this chart I showed you three months ago.

It shows how returns in excess of inflation for the US stock market have risen and fallen in multi-decade waves. When returns become extreme, they automatically reverse — and quite sharply at first.

What's unique about this cycle is how the initial sharp falloff in returns in 2019 was arrested by the massive stimulus during the pandemic, only to followed by another sharp fall as the Fed began to hike interest rates. Nevertheless, today, assuming inflation holds steady at 3%, the latest annual CPI figure, S&P 500 returns over inflation would be 105% and the returns for the Dow Jones Industrial Average would be 76%, both less than half of the peak gains in 2019.

Translation: Two years of huge market gains in 2023 and 2024 haven't stopped the inexorable decline in market returns.

Grantham ranks this as the third-biggest bubble ever

As Grantham sees it, the most recent super bubble — what I'll call the "US exceptionalism bubble" — reached its peak during the pandemic in 2021. He ranks it as the third-most prolific in modern history, much further behind the twin stock market and real estate bubbles that burst in Japan after 1989.

I've always looked at it from the point of view that the longer and the bigger and the higher it goes, the more exciting and dangerous it will be, and this has moved up the rank of super bubbles, but it's nowhere near Japan, the mother and father of all super bubbles in '89, and it's nowhere near their real estate bubble of the same era. 

Where I differ is that we can already see the narrowing of the bubble during the pandemic. With the first peak in 2019, we saw the Nasdaq with 433% inflation-adjusted gains over 10 years, followed by 218% for the S&P 500 and 208% for the Dow. But by 2021, the Nasdaq was really inflating, with gains at 480%, while the S&P 500 narrowly missed its prior peak at 215%. What's telling is that the Dow only got to 156%. So this was a bull market yes, but one led by tech and meme stocks, with more old-line companies such as are represented in the Dow barely participating.

Also, the inflation-adjusted gains maxed out at higher levels for the S&P 500 in the two prior US super bubbles, which ended in 1959 and 2000, respectively. Arguably then, while a super bubble, this latest one isn't quite as large as the two that preceded it in the US.

Tighter policy is the catalyst for popping a super bubble

If you look at the Japanese super bubble and those previous two in the US, in each case the bubble popped after monetary policy tightened. In Japan, loose monetary policy after the 1985 Plaza Accord finally came to an end in late 1989, leading to a spectacular fall of two-thirds in the stock market by mid-1992. In the US, the Greenspan Fed started hiking rates in June 1999, with the bubble popping  the next year. And in 1959, the Fed raised the discount rate from 2.5% to 4%, precipitating a recession that began a decades-long dive in long-term market returns.

Here's the thing, though. There was no crash in the stock market in 1959. Stocks gained 8.5%, and the next year the S&P 500 lost 3% but then gained 23% in 1961. So in a very real sense, while tighter policy precipitated the long-term decline, it didn't pick up in earnest until inflation came rip roaring in the latter half of the decade during the "Guns and Butter" strategy of Lyndon Johnson. Inflation never fully receded from view after that until Paul Volcker crushed the US economy with spectacularly high interest rates more than a decade later.

In some senses, then, what we are experiencing now is a lot more akin to 1959 than to any of the other supper bubbles I've mentioned. And just like back then, we may not see a real deflation in equity prices unless inflation becomes entrenched and pronounced or the guns-and-butter strategy that has the US federal government deficit at 6% of GDP goes away. That— and the fact that the peak returns during the latest super bubble were lower than during the previous two — allows for some hope that the bubble just deflates instead of popping. 

Trump could bring about a crash

There are two ways that Trump can bring about a crash — and unfortunately he's doing or promising to do both right now.

First, there's inflation. As Grantham put it in his talk with Merryn Somerset Webb:

Ben Inker at GMO and I, 25 years ago did a behavioral model which says forget all the logic about the efficient market or how it should work and dividend discount models and all that, just let's see what actually it explains and what is explained since 1925 and explained very well indeed is low inflation, the market loves it. High inflation, it hates.

Exactly right. The 1959 climb-down only picked up steam after 1967, when the inflation rate went from 3% to 5% by 1971, precipitating another monetary policy tightening and recession.

If Trump's tariffs are more than a one-time price step-up, something that inflicts lasting damage on inflation rates due to unanchored inflation expectations, we could go from 3% CPI to 5%, just like in the late 1960s. And the exact same scenario would play out, with the Fed being forced to hike rates and the economy falling into a recession, spurring deep losses for stocks.

Trump could also take DOGE a step further. As my Bloomberg colleague Claudia Sahm put it on her Substack newsletter recently, "Civilian federal employment (including the Post Office) is currently 3 million, or less than 2% of the labor force." DOGE may be divisive. But cuts by DOGE simply aren't large enough in and of themselves to cause a recession. If Trump takes a sledgehammer to defense spending and Medicaid, or touches Medicare or Social Security, we'd be looking at a much more impactful restriction in fiscal largesse. I would go as far as saying that just reaching the 3% deficit goal of Treasury Secretary Scott Bessent from today's 6% level would be enough to cause a recession. But nothing I have seen so far — either from DOGE or tariffs — is in that order of magnitude.

The risks are mounting

Still, some of the economic numbers of late have been truly awful. 

The US economy is just barely growing right now. And if you believe the latest GDPNow tracker from the Atlanta Fed, the economy could even be contracting. It won't take much to tip the US into recession. Most recessions begin with a cutback in capital investment. And so, to the degree tariffs stop firms from making investment plans, they could have a very negative impact catalyzing a downturn.

What's more, extreme valuations make the market extremely vulnerable. I'm not talking about Nvidia or Tesla. Those are known extremes. I am talking about companies like Walmart, Coca-Cola and Proctor & Gamble that you might expect to benefit from the recent rotation into defensive stocks. Walmart trades at 38 times earnings, with an astronomical price to growth ratio of 4.4. That says the valuation multiple is four times the rate of actual earnings growth. Coca-Cola might have a more reasonable P/E ratio of 24. But you're still paying 4.2 times as much as the underlying growth rate. And the metrics for Proctor and Gamble are about the same as they are for Coca-Cola, by the way.

This market is overvalued from top to bottom by almost all standard valuation metrics. And it's not just growth stocks, which are expensive. Almost every stock is expensive. This is why Warren Buffett isn't buying stocks, including his own, and why he is sitting on a record amount of cash.

What's the takeaway? The data haven't deteriorated enough to think we are at the tipping point for an epic bear market, as I argued last week. But this isn't a time to load up on risk. The downside risks in the market are rising and the valuation makes it vulnerable to any further rise in inflation or cut in the federal deficit. Either of those two outcomes will precipitate the next bear market.

P.S. — On that Grantham podcast episode:  You can find it on Apple, Spotify, or wherever you get your podcasts. And a thought: I know Grantham has been written off by some of you as a perma-bear. I don't see it that way. He's a value investor who has suffered during an investment climate that has been extremely hostile to value. We see that in Buffet's record cash pile. I highly recommend this particular podcast. Listen to it with an open mind in the context of everything that's happening right now. You wont regret it.

Quote of the week

"Berkshire will never prefer ownership of cash-equivalent assets over the ownership of good businesses, whether controlled or only partially owned."
Warren Buffett
CEO, Berkshire Hathaway
Comments from Buffett's latest annual letter to shareholders, which implicitly explain his mounting cash pile as recognition of poor market value prospects

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