Why margin debt doesn't matter

Kingran - I don’t get it. What does the Fed balance sheet have to do with margin debt?

@eldemonio, Everyone was pointing the fed balance sheet growth is the reason the markets are up, and once fed starts shrinking balance sheet, the market will decline. When the arguments were presented against that thesis, it will matter when it is… similar to your argument about margin debt.

No the fed balance sheet shrinking, QT, didn’t impact the stock market. Similarly margin debt doesn’t matter. All outstanding margin debt is < 2% of the SP 500 market cap. The stock market had 6 stress test in the last 5 years, from COVID to fed rates hike, to tariffs to US bombing Iran… and margin debt/ margin call didn’t cause any market disruptions.

There are lot of myths, “conventional wisdom” that are not supported by data. Investors, should learn to put those “beliefs” to test, test it against data and it should validate your hypothesis. If they are not, then you should assign lower preference to them.

I still don’t get it, and now we’re in the Liquid Lounge? I’m super confused. Margin debt poses a systemic risk to overall market liquidity.

Unless…the liquid you’re referring to is the result of overconfident investors peeing their pants when a margin call comes a-knockin’?

Not at all. The best way for you to understand is, when was the last time market had a major meltdown because of margin debt. How long it lasted.

When you have some data we can discuss that. :slight_smile:

Welp, there’s the big one in 1929. Sure, leverage rules now limit how much can be borrowed, but there’s still risk.

Then there’s the dot-com bubble bursting that was preceded by a spike in margin debt.

The 2008 financial crisis started with subprime mortgage defaults, but then quickly spread across the financial system because of margin calls.

Maybe our Chinese friends can explain to us how margin trading exasperated their market crash in 2015?

Margin debt may not directly cause crashes, but it pours gasoline onto the fire.

I guess we don’t have to worry as long as we’re not in an AI bubble…seems like there are mixed opinions on that front -

Driving 120 MPH in itself doesn’t cause car crashes. That doesn’t mean the outcome should there be an accident won’t be much more severe.

Let us get the facts clear… it is not the margin debt in equity market, rather the financial firms borrow lot of money in short-term from other firms, and often they post collaterals like UST and other assets against that borrowing, they used that borrowed money to buy mortgages and mortgage bonds, and when the value of those bonds started falling, they were left with illiquid assets against which they could not borrow, that is not same as margin debt that you are talking.

There are gazillion theories, when you put them to test, many fail. Also, often we confuse correlation as causation. The subprime issue is not a margin debt issue.

Margin debt is not a systemic issue. Time to time few individuals over extend, institutions make lending mistakes that blow up few hedge funds, that are caught on the wrong side of the trade. They are not systemic issue.

How can we be clear when you’re obscuring the facts?

You provided nothing except your hunches. You know what.. you are right, the world is going to end because of margin debt.

Goodbye…

You’re being emotional. These aren’t hunches, it’s logical. If we’re in an AI bubble and it pops, the amount of borrowed money invested in the AI market will cause serious problems. Them’s the facts.

You can argue that we’re not in a bubble, fine, make the argument. But what you can’t argue is the amount of borrowed money being at an all-time high, nor the effects margin debt has on bubbles busting.

I’ve noticed you have a habit of saying goodbye when people don’t agree with you. That’s sorta lame.

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Yes you are correct, I am emotional. You deduced that logically. Make sure, you withdraw the cash from the bank before the banks run, because deleveraging already started, and on-going for the last few day, private credit companies are going bankrupt, there is fraud in PE market, gold dropping at historic level, crypto is tanking…

The world is coming to an end.. Running With Hair On Fire GIFs | Tenor

Except, so far very little borrowed money is used… of course if you say they are facts, it has to be.

It’s at an all-time high!

https://www.advisorperspectives.com/dshort/updates/2025/10/20/margin-debt-finra-jumps-new-record-high-september-2025#:~:text=Margin%20debt%20reached%20a%20new,the%20previous%20two%20months’%20data.

It’s up almost 40% YOY. Bonkers.

Are you kidding or seriously you have understanding issue??? First of AI investments are not same as people buying stock on margin debt. Few individuals buying stock on margin is not going to pop AI investment cycle. If you don’t comprehend this simple fact, let us stop discussing at this point. Also, don’t look at nominal number, look at it as % of market cap, this is not historic number.

In either case, I should stop this discussion. If you want to believe the world is coming to an end, hop you have take necessary precaution and good luck.

Of course it’s not. All of the money flowing into AI stock, where is it coming from? More and more of it is margin debt.

Here you go -

https://www.advisorperspectives.com/dshort/updates/2025/10/20/margin-debt-finra-jumps-new-record-high-september-2025#:~:text=Margin%20debt%20reached%20a%20new,the%20previous%20two%20months’%20data.

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