A Reason Behind Bitcoin's Weekend Crash -- and Why It Could Be a Harbinger for the Stock Market

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On Saturday, Bitcoin (CRYPTO: BTC) crashed about 17% in less than 24 hours, going rom $57,000 to around $47,000, before partially recovering. Other altcoins also followed suit, in a wide crypto sell-off following a two tumultuous weeks for the markets.

"Flash crashes" like this have happened occasionally, especially in the volatile cryptocurrency markets, and there was no specific reason for Bitcoin's plunge. After all, Bitcoin just underwent a big update last month that should actually greatly enhance its utility. Still, cryptocurrencies are often grouped together with high-multiple tech stocks by many investors -- and those stocks have been hammered recently amid concerns over higher interest rates.

Whatever the reason, there was another big factor that exacerbated Bitcoin's plunge... and that same factor is also present in the stock market right now. Should stock investors be worried they'll be next?

Image source: Getty Images.

Margin levels inject risks of bigger sell-offs

Before the sell-off, analysts were concerned about increased leverage in the Bitcoin futures market. What does this mean? That investors and speculators were using margin loans to buy more Bitcoin in hopes of a year-end rally. While buying any security on margin can enhance returns, when a security goes down, it has the opposite effect of augmenting losses.

In fact, margin levels in the Bitcoin market weren't just a December concern. Margin levels across Bitcoin exchanges have actually been elevated since late October. Back then, the amount of leverage exceeded the yearly high from back in April -- just before a massive 50% sell-off shortly thereafter.

Despite leverage being high and many analysts warning of a sell-off, that hadn't really happened until this weekend. Crypto analyst Arcane Research said in a report earlier this week that, "It is not common to see such a high open interest being sustained for such a long duration. This could suggest that the market is currently oversaturated with leverage."

Sure enough, Bitcoin's recent sell-off -- whatever the cause -- apparently triggered either panic selling or margin calls responsible for its  rapid decline on Saturday.

Could the same thing happen to the stock market?

While Bitcoin and other cryptocurrencies are quite popular, the stock market is obviously much, much bigger, and stocks can also be bought on margin. So could a year-end "flash crash" happen in the stock market too? We have obviously seen very rapid corrections in the recent past, including a near-20% drawdown in December 2018, and of course the fastest-ever correction as COVID-19 hit in March of 2020.

One reason for concern today is that margin loans have gone up a lot this year, rising to $936 billion, which is close to an all-time high and up 40% over last year, according to Yardeni Research. Depending on how leveraged one is, a material drop in stocks could trigger margin calls, leading to a very quick liquidation in stocks.

So, should one be worried about a crash? It's always something to be concerned about, but I also don't think there is reason to panic, especially if you have low- or preferably no-margin debt and a long time horizon.

First, it's possible widespread margin calls won't happen. While the levels of margin debt are near all-time highs again, they are still below the all-time high ratio when looking at debt as a percentage of the market cap of the overall market, as measured by the S&P 500 . The current level is 2.4%, still a good bit below the all-time high level of 3.5% set back in 2008. And for all the concern over the omicron variant, early indications are that symptoms are milder than previous strains of COVID -- although data is still coming in. That means economic lockdowns are unlikely.

Of course, 2008 isn't exactly a great period in the market with which to be compared. In addition, that 2.4% is higher than the roughly 2% levels seen before the COVID-19 crash. Furthermore, the ratio could go up if the S&P 500 falls more. For all the turmoil in high-growth tech stocks recently, the S&P 500 only sits about 4.3% below its all-time highs.

Yet even if a leverage-induced market crash does happen, a big market sell-off can also spell opportunity for those making regular contributions to their portfolio. Remember, those harrowing sell-offs from 2018 and 2020? Both proved to be terrific buying opportunities as stocks overshot to the downside due to that very forced selling from margin calls. So margin-caused sell-offs, while bad for those getting the calls, can be gold mines for Foolish investors that regularly invest and have a long time horizon .

All the more reason to live with in your means, invest regularly, and to not use much (or any) in the way of margin loans.

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Billy Duberstein owns shares of Bitcoin. His clients may own shares of the companies mentioned. The Motley Fool owns shares of and recommends Bitcoin. The Motley Fool has a disclosure policy .

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