Yen nears 38-year low: market holds breath for Japan Finance Ministry intervention

Keywords: Yen depreciation; USD/JPY; forex intervention; Japan Finance Ministry; historical exchange rate high

Introduction

In July 2024, the global forex market experienced another sharp shock. USD/JPY broke through the 161.95 mark, approaching levels not seen since 1986, just a step away from the 38-year historical peak. This figure not only touched market nerves, but also sparked strong expectations of possible forex intervention by Japan's Finance Ministry. Notably, the breakout occurred during the U.S. market holiday—a special time window considered by insiders as an "intervention window"—sharply heightening risk aversion among market participants. Behind the persistent yen depreciation lies a complex game of monetary policy, capital flows, and macroeconomic resilience.

I. Deep driving forces behind yen depreciation

The weak yen against the dollar is not a recent phenomenon. The fundamental cause is the persistent policy divergence between the U.S. and Japan: the Fed has kept high interest rates to curb inflation, while the Bank of Japan (BOJ) has stuck to ultra-loose policy even amid global tightening. Although the BOJ ended negative rates in March 2024, its benchmark rate remains at 0-0.1%, a huge gap with the Fed's 5.25%-5.50%. This spread has triggered massive "carry trades"—investors borrow cheap yen and invest in higher-yielding dollar assets, consistently weighing on the yen.

Beyond the rate gap, Japan's long-standing trade deficit also exerts structural pressure. Higher energy and raw material import costs, along with limited repatriation of overseas profits despite the yen's weakness, keep yen supply-demand weak. Moreover, global risk sentiment has an asymmetric effect: when risk appetite rises, the yen as a funding currency is sold off; when risk spikes, the yen may rally but not as strongly as the dollar.

II. Historical perspective: exchange rate changes since 1986

In 1986, the yen touched around 162 against the dollar, just before a significant appreciation following the Plaza Accord. Thereafter, the yen entered a nearly decade-long appreciation cycle, reaching a record high of 79.75 in 1995. Now, as the yen again nears the 38-year low, this cycle reflects not only Japan's structural transformation from an "economic miracle" to the "lost three decades," but also the evolving power structure of the global monetary system.

Notably, the 1986 low was not purely market-driven—the U.S. trade deficit with Japan soared at that time, eventually forcing Japan to sign the Plaza Accord in 1985 to boost the yen. The current environment is the opposite: the U.S., grappling with its own fiscal deficits and inflation, cannot tolerate excessive dollar weakness, while Japan, facing aging population and declining industrial competitiveness, cannot bear excessive yen strength. Thus, the return to historical lows is both a market force and a new global imbalance signal.

III. Intervention game: Japan Finance Ministry's "cry wolf" dilemma

Faced with continuous yen decline, the Finance Ministry has issued repeated verbal warnings and conducted three actual interventions between September and October 2022, spending over 9 trillion yen. However, intervention effects are often short-lived—given the huge rate gap, one-sided dollar-selling is like a drop in the bucket. Currently, the market is especially focused on the "U.S. holiday" window. With thin liquidity during the New York market close, if Japanese authorities choose to enter at that time, they could trigger a large exchange rate move at a lower cost to deter speculators.

Yet intervention carries huge risks. First, if fundamentals haven't changed, intervention only provides short-term emotional impact, and the market may retaliate with more aggressive selling. Second, frequent intervention may draw criticism from trading partners—the U.S. Treasury has repeatedly placed Japan on its "currency manipulation watch list" in recent years. Although Japan defends its actions as curbing excess volatility rather than competitive devaluation, the actions themselves still risk diplomatic friction. Finally, once the market forms an expectation of "intervention failure," it may accelerate the yen's decline.

IV. Transmission effects on Japan's economy and global markets

Yen depreciation is a double-edged sword for Japan's domestic economy. Export-oriented companies benefit significantly—Toyota, Honda, and other automakers see profits surge; tourism and retail thrive due to increased purchasing power from foreign visitors. However, ordinary citizens bear the burden of rising import prices and living costs. Japanese real wages have fallen year-on-year for many months, consumer confidence remains low, constraining domestic economic circulation.

From a global perspective, yen depreciation intensifies competitive depreciation pressures on Asian currencies. The Korean won, Thai baht, and Malaysian ringgit come under pressure, potentially triggering regional currency turmoil. Meanwhile, as the world's third-largest reserve currency and a major carry trade tool, the yen's persistent depreciation also disturbs international capital flows and increases global financial market volatility.

Conclusion

The current moment when the yen approaches a 38-year low is both a fierce collision point between market forces and policy intentions, and a key window to observe the decision-making resilience of the BOJ and Finance Ministry. In the short term, if USD/JPY breaks through 162 or even 165, the Finance Ministry is highly likely to intervene during U.S. holidays or other low-liquidity periods. But in the long run, for the yen to truly stabilize and recover, it must rely on more decisive monetary policy normalization by the BOJ—whether further rate hikes or a reduction in bond purchases. Meanwhile, changes in U.S. economic data and the timing of Fed rate cuts or delays will directly affect the rate spread.

For investors, now is the time to stay clear-headed: amid repeated tug-of-war expectations over policy intervention, exchange rate volatility could be extremely sharp. The real turning point may not come until there is substantial convergence in the monetary policies of the two largest economies. Whether Japan can escape the "lost exchange rate" is closely linked to its ability to regain endogenous growth momentum—this is not just a monetary issue, but a test of deep economic transformation.