A stock market bubble of epic proportions

First, please read the Disclaimer.

A great deal has been written in recent years about real estate bubbles, stock market bubbles and even bond market bubbles. But there is really only one kind of bubble — that is a debt bubble. Without low interest rates fueling rapid debt growth, any form of bubble would wither on the vine.

The Wilshire 5000 broad market index, compared to profits before tax, recently peaked above 15.0 for only the second time in history before retreating to 13.97 in Q3. The fall in Q3 is attributable to recovering profits rather than falling stock prices, so a return to above 15.0 seems likely if the index rises in response.

Wilshire 5000 Index/Profits

The reason for the surge in stock prices is clear on the chart below: interest rates at close to zero for an extended period act like rocket fuel.

Wilshire 5000 Index/Profits & 3-Month T-Bill Yield

Anna Schwartz, co-author of A Monetary History of the United States (with Milton Friedman, 1963) once said:

If you investigate individually the manias that the market has so dubbed over the years, in every case, it was expansive monetary policy that generated the boom in an asset. The particular asset varied from one boom to another. But the basic underlying propagator was too-easy monetary policy and too-low interest rates.

That is particularly true of the current bubble.

When will it end?

The Fed seems unlikely to change course and is expected to keep interest rates near zero for an extended period, so when is the bubble likely to end?

If bank credit growth stalls, falling to zero (the red line) as it did before the last three recessions, stock prices are likely to tumble.

Wilshire 5000 Index/Profits & Bank Credit

There may be three possible causes of slowing credit growth:

  1. Inflation surges, forcing the Fed to raise interest rates;
  2. Low interest rates cause investment misallocation, as in the Dotcom and subprime bubbles, leading to rising defaults and tighter bank credit; or
  3. An external shock causes falling aggregate demand and high unemployment, with banks tightening credit policies in anticipation of rising defaults.

Chairman Jay Powell has assured us that the Fed will tolerate higher inflation, with its new policy of inflation averaging, so higher interest rates do not seem to be a major risk. While there has been some investment misallocation, falling aggregate demand and high unemployment seem to be the greatest threat.

Initial claims for unemployment insurance jumped to 853,000 for the week ended December 5th, while initial claims for pandemic unemployment assistance surged to 427,600.

Initial Claims

Latest Department of Labor figures (November 21) show total unemployment claims remain high at 19 million — or 1 in 8 people who had a job in February 2020.

Bank credit standards have tightened significantly.

Bank Credit Standards


Keep a close watch on bank credit growth. If this falls to zero, then stock prices are likely to tumble.

Bank Loans & Leases

Commercial paper often acts as the canary in the coal mine, giving advance warning of a credit contraction.

Commercial Paper Outstanding

Quote for the Week

"The more spectacular the rise and the longer it goes, the more certainty one can have that you're in the 'Real McCoy' bubble. You want to see lots of crazy behavior, which we really have seen a lot of ....and you want to see not just the market rise, but if anything, an acceleration. And the rate of market rise, since the turn in March/April, has been nothing sort of sensational."

~ Jeremy Grantham, co-founder and chief investment strategist of GMO, November 12, 2020


Colin Twiggs is director of The Patient Investor Pty Ltd, an Authorised Representative (no. 1256439) of MoneySherpa Pty Limited which holds Australian Financial Services Licence No. 451289.

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