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Decoding yesterday’s crypto and stock market Crash: What went wrong?
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Decoding yesterday’s crypto and stock market Crash: What went wrong?

Today, financial markets saw a bloodbath. Bitcoin plunged below $90,000 again, the S&P 500 lost 1.5%, and silver plummeted by 5.6%. This widespread correction is not a coincidence but a direct result of shockwaves from Japan. The looming possibility of a rate hike by the Bank of Japan (BOJ) on December 19 has sparked panic, signaling increased volatility ahead for crypto investors.

Written by Charles Ledoux

Translated on December 14, 2025 at 20:52 by Simon Dumoulin

Gold Bitcoin coin with red symbol and Japanese flag in background.
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The Japanese Carry Trade: Markets’ Ticking Time Bomb

To understand Japan’s impact, you need to know about the carry trade. For decades, the BOJ has maintained extremely low interest rates to stimulate its economy. Investors worldwide took advantage: they borrowed massively in Japanese yen at virtually zero cost, then invested this money in riskier and more profitable assets like US stocks or the crypto market.

This strategy, while lucrative, has created a ticking time bomb: hundreds of billions of dollars in investments relying on low Japanese rates. When the BOJ threatens to raise its rates, the entire system reverses.

The Unwind: How a Rate Hike in Japan Crashes Bitcoin

The mechanism is brutally simple. When the BOJ raises its rates, the cost of borrowing in yen increases, forcing investors to unwind their carry trade positions. To repay their yen-denominated loans, they must sell the assets they had purchased: stocks, cryptos, commodities.

This massive, simultaneous selling across all markets creates enormous selling pressure and a correlation where all risky assets drop together. This is exactly what we saw yesterday: a widespread flight to safety in anticipation of the BOJ’s decision.

Volatility Expected Until December 19

According to Bloomberg sources, the BOJ wouldn’t stop at just one hike but is planning additional increases for 2026. This prospect of a lasting monetary regime change in Japan, after decades of low rates, is what’s frightening the markets, including crypto.

Uncertainty about the magnitude of the December 19 rate hike will fuel strong volatility until that date. Traders are adjusting their positions, creating erratic movements. Yesterday’s drop is probably just a taste of the nervousness that will reign over markets in the coming days.

Yesterday’s widespread crash is a brutal reminder that financial markets are an interconnected global system. A monetary policy decision made in Tokyo can have immediate and violent repercussions on the price of Bitcoin and the S&P 500. As investors anxiously await the December 19 decision, caution is warranted. The end of the easy money era in Japan could well be the “black swan” no one was expecting, and the aftershocks could be felt for some time yet.

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Charles Ledoux

Charles Ledoux

Charles Ledoux is a Bitcoin and blockchain technology specialist. A graduate of the Crypto Academy, he has been a Bitcoin miner for over a year. He has written numerous masterclasses to educate newcomers to the industry and has authored over 2,000 articles on cryptocurrency. Now, he aims to share his passion for crypto through his articles for InvestX.

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