Oil Rises, Japan Falters
The U.S. chose intervention, buying yen and U.S. bonds, but it is a band-aid fix at best
Read Time: 8 Minutes
Key Points
Japan’s debt load is in a different league from other developed markets, and the population is shrinking underneath it.
The 1980s Japan crash was also largely an oil shock, but to a younger, growing economy with far less debt-to-GDP. This one is now hitting an old, import-dependent economy living on borrowed time.
The U.S. bond market gets hit hard when Japan stumbles.
Japan's Outlook
Japan's debt-to-GDP ratio is currently at the highest level in any developed country, and its declining population is acting as fuel to the fire. Most developed countries' ratios are 70-100% of the debt to GDP, Japan is near 215%.
Japan’s 1980’s Crash
Japan in the 1980s was a different country with its booming economy and exports from the its ultra-competitive auto and technology Sector. The Nikkei index went from 4,000 to 38,500 in a span of 8 years.
Then it crashed to 15,000 in just 3 years. A lot of investors and institutions got their fingers burned. Through the 1990’s it made another major run. It moved from 22,000 index in 1996 to 7,500 index in 2003 and then moved sideways for decades.
Japan’s latest run rhymes with the 1980s on the chart. From the post-bust basement near 8,000, the Nikkei ran to a June 2026 peak above 72,000, another roughly 10x move. It has since slipped to about 64,000, off more than 11% from that high.
Why a New Crash Could be Worse
Back in the 1980's Japan's debt-to-GDP ratio was around 60% on average, its population was growing, and the majority of the population was young workers and businessmen. The crash in that decade also produced a strange new effect in the job market: Japanese companies abandoned the traditional "job for life" promise, leaving workers vulnerable to sudden corporate downsizing.
Fresh university graduates could not find stable career tracks, forcing millions into low-paying, dead-end part-time jobs. Annual salary raises disappeared completely, causing household purchasing power to stagnate for over thirty years.
Corporate profit drops led companies to instantly slash the massive seasonal bonuses workers relied on to pay mortgages, and also resulted in employees clocking massive amounts of unpaid, stressful overtime just to prove their value and avoid getting fired. The market crash was very bad, but people were able to make their way back because age demographics were in their favor.
Now, with an aging population and low fertility rates, the consequences of economic downturns will be far worse than it was back in the 80s.
One of the main causes of the previous crash was high interest rates. Rates went from 2.5% to 6% in a span of 1 year. In fact, it happened so fast that markets and people didn't have enough time to make adjustments; borrowing became difficult, and leverage was forced out of the system.
Japan's New Historic Rate Hikes
Recently, Japanese interest rates went from 0.25 to 1%, causing alarm bells around the globe. The “yen carry trade”, which was largely fueling risk-on asset outperformance, is getting hit the hardest. Institutions that could borrow cheap money with near-zero interest rates and invest in high-risk plays to profit are changing behaviour rapidly. The era of cheap money is coming to an end.
After years of rates near zero, in June the Bank of Japan hiked the policy rate to 1%, and the next meeting on September 17–18 is expected to push it to 1.25%, which would be the highest in 30 years. Furthermore, the June rate hike was not unanimous; there was a dissenting vote. The last time the board split like that on a live rate change was a decade ago. But they hiked anyway, into an oil shock and a weak yen.
Back in the 1980s, what caused the rate hikes? Interestingly enough, it was an oil shock feeding into an inflationary environment, and the BOJ (Bank of Japan) was forced to increase interest rates.
Readers will notice a very similar situation is happening now, arguably on a very different scale. Oil at the time of writing is now sitting at $100 a barrel and is expected to go beyond $120 if the conflict with Iran is not resolved soon. Which, by the looks of it, is getting worse and spreading throughout the GCC (Gulf Cooperation Council) countries.
U.S Emergency Oil
What was keeping oil prices lower through the summer months was largely the US subsidizing supply to maintain the price below $100, but US reserves are shrinking rapidly. Ships were sending a steady supply across the Pacific to aid the Eastern Hemisphere.
The U.S. SPR (Strategic Petroleum Reserve) has officially dropped to 285.4 million barrels, its lowest inventory level since November 1982. This significant decline is primarily driven by these recent geopolitical events and coordinated emergency policies.
The emergency stockpile was already strained from a prior historic release of 180 million barrels ordered during the Russia-Ukraine war to stabilize surging consumer fuel prices. The SPR is housed inside 60 underground salt caverns across Texas and Louisiana. Energy experts and lawmakers warn that letting the volume drop below the 250 million barrel threshold presents major risks.
Why Japan Matters
Japan is an import-dependent economy. They import all their oil needs and the majority of their food supplies. Japan's currency has weakened this year as expensive oil causes inflation across the board and also dampens its economic activity, similar to the 1980’s scenario. And its effect, with rate changes and economic troubles, will be felt across the globe, especially in the US.
Keeping all the above factors in mind, Japan is the biggest holder of US treasuries, which makes the US vulnerable to Japan's weakening economy. In April 2026, Japan was holding $1.2 trillion in US Treasuries, and in June it was reduced to $1.15 trillion, and now it's sitting at $1.12 trillion. That's a 7.7% decrease in just a matter of a few months.
From July 30 through August 26, Japan spent a record ¥15.4 trillion (roughly $97–99 billion) buying yen to stop the slide. Official reserves then posted their largest drop on record, down $79.6 billion to $1.208 trillion. Their balance of foreign securities, the portion that is mostly U.S. Treasuries, fell about $88 billion.
This is one of the fastest declines in the Treasury of Japan in recent history. When Japan is forced to sell U.S. Treasuries, the US Bond market suffers. Many other countries are already selling U.S. Treasuries in a similar way.
U.S. Intervention
That is why the United States government stepped in. On July 31, Treasury Secretary Scott Bessent sat in a Camp David cabinet meeting with a notepad that read “Buy Japanese Yen $5–10 bil.” The evidence of this later surfaced when a photograph of the note was spread across social media.
Washington then joined Tokyo in buying yen, the first U.S. purchases of the currency in decades, and the first coordinated U.S.–Japan intervention since 2011. Bessent has not been subtle since. He said the U.S. would do “whatever it takes,” and this week told markets he is “the house now.”
When asked about that operation, Trump stated “we are very strong financially and they have weakening yen and they want a little bit of help, and we have always been there for Japan, Japan has been very good to us with the exception of course to Pearl Harbor.” Friendship, financial strength and Pearl Harbor all covered in one statement, which obviously makes it a very Trump thing to say.
Where is this money coming from for all this yen buying? The funding originates from the ESF (Exchange Stabilization Fund), a specialized vehicle that can be deployed without congressional approval to preserve the dominance of the U.S. dollar.
Make no mistake: the United States is not acting out of altruism or friendship. Driven by desperation, the U.S is intervening solely to shield its own bond market. Furthermore, instead of selling dollars to buy yen, the Treasury liquidated roughly $13 billion worth of euros held within the fund. The European Central Bank was only notified after the transaction had already occurred.
Then on August 19th, the U.S. Treasury announced that it will at least double the size of its long-end bond buyback operations from $2 billion to at least $4 billion per operation. Now some can argue that Bonds should be left alone to keep them a fair market and should behave according to free-market forces. The U.S. Treasury is now effectively manipulating the bond market by stepping in; they are doing this because they seem to have few options left on the table.
This unilateral action risks further strain to the already tense U.S.-Europe relations and could significantly reshape the global order in the coming months. This raises the critical question: will it actually fix the problem?
Band-Aid Fix
U.S. intervention might buy some time, but it is definitely not a permanent fix. The U.S. certainly wants to slow Japan from a fire sale, but with rising global debt, war-induced oil shortages, and insatiable government spending, these recent interventions are just punting all the major issues further down the field.
Special thanks to Jake Tullis, Macroanalyst at Rothguard, for key insights and research.
Takeaways
1. The Bank of Japan made historic hikes with a dissenting vote. Rising rates have diluted the yen carry trade and threatened U.S. bond markets.
2. The U.S. chose intervention, but buying yen and U.S. bonds is a band-aid at best. It can restore some confidence in markets, but it falls short of a real solution.
3. Having a cash buffer, even with rising inflation, could be useful. Gold and silver could also continue to hedge in an environment like this as sovereign states add them to their balance sheets. Energy-based investments with dividend yields could continue to play out well in the near-term as the turmoil in the Middle East continues.
