Every so often, margin debt headlines resurface as a supposed warning sign for the stock market. The latest iteration: U.S. margin balances have crossed one trillion dollars for the first time.
David Rosenberg highlights:
“For the first time ever, margin debt has topped $1 trillion and has ballooned +25% over the past year. Fully one-fifth of all the leverage supporting the stock market has been built up just in the past year alone; almost half of the outstanding margin debt has come in the past five years alone. That is quite an achievement. It’s also pretty scary.”
While that sounds ominous, this post will outline why it is not particularly useful.
The core issue is that margin debt is a coincident indicator. It moves with the market. When equities rise, account values increase, and investors naturally take on more leverage. Margin debt rising ~25% over the last year? The S&P 500 is up about the same. Margin debt has almost doubled over the last five years? The S&P 500 is up about the same.
Source: Yardeni Research
Historically, margin debt peaks alongside other coincident metrics like stock prices, earnings, and economic strength. That is because it is part of the same cycle. Margin debt does not predict market tops any more than corporate profits or index levels do. It tends to follow rather than lead.
None of this is to say leverage is irrelevant. It can certainly amplify market moves, especially on the way down. But we believe using margin debt as a standalone warning sign is misguided. Most of the time, it is just a byproduct of rising markets. By the time it reverses, the market already has.
If anything, the total dollar value of margin debt should be normalized against something, such as the total market cap of equities. Even then, the relationship with future returns is noisy at best. A high margin-to-stock market cap ratio might indicate more fragility, but it still won’t tell you when the next correction will hit. We also happen to have a very low level of margin debt normalized against the market cap of US stocks.
Source: Yardeni Research
Yes, leverage matters. But earnings, interest rates, liquidity, and sentiment matter more. Margin debt is part of the story, not the story.
So the next time you see a chart of rising margin balances used to forecast a crash, remember this: margin debt reflects where we are, not where we’re going.
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