Bitcoin Faces First Simultaneous Central Bank Tightening Since 2006

For the first time in nearly two decades, three major central banks are set to tighten policy simultaneously. Historically, such a convergence has hit leveraged assets hardest.

The European Central Bank has already acted. The Federal Reserve makes its decision on Wednesday, and the Bank of Japan follows on Friday. The concern for Bitcoin (BTC) is how this combination previously affected riskier investments.

The 2006 Playbook for Risk Assets

The ECB acted on September 10, lifting its deposit rate to 2.50%. Market futures now show nearly 90% odds that the Fed will hike.

"The conflict in the Middle East continues to generate inflation pressures, and inflation is set to remain well above target for an extended period," ECB Governing Council said.

Back in 2006, the tightening hit on May 10. Within the following month, losses mounted in a distinct sequence.

• The S&P 500 dropped 7.7%
• Europe's Euro Stoxx fell 13.3%
• Japan's TOPIX declined 16.5%
• Emerging markets lost over 20%

That pattern was no coincidence. Borrowed funds had flowed into the highest-yielding assets. Once borrowing costs rose, the most speculative positions were offloaded first.

Markets later rebounded, and the S&P 500 still ended 2006 with a 15.79% gain. The true collapse came two years later, rooted in mortgage debt.

Where Bitcoin's Macro Risk Really Lies

Bitcoin was not around in 2006, but it has since faced a somewhat comparable challenge.

In August 2024, the Bank of Japan raised rates, causing the yen to surge. Japan's TOPIX index lost 12% in a single day. Bitcoin dropped as much as 20%.

On the 2006 scale, Bitcoin is not the S&P 500. It is the emerging market, and the squeeze is already underway, as Japanese equities have slid 8.4% in a month.

What Could Rescue It

This month brought a shift. The yen gained 3.7% over three sessions, yet Bitcoin stayed above $79,000, effectively breaking the 2024 pattern.

It had also already fallen 33% over the past year, trading at $77,871 at the time of writing. The de-rating happened before the squeeze, not during it.

Additionally, a new type of buyer has emerged that was absent in earlier cycles. US spot Bitcoin ETFs brought in $3.52 billion in August. That offset more than the $5.30 billion that had exited in the preceding seven months.

That capital is not yen-denominated debt. A funding squeeze does not necessarily force it out. Unless that buying stops, this week's daily fund flows could soften the impact of the rate decisions.