In June 2026, the Bank of Japan announced an increase in its policy interest rate to 1%, marking the first time since 1995 that Japan has raised its policy rate to this level. In absolute terms, a 1% interest rate is not particularly high among major global economies. The U.S. federal funds rate remains above 4%, and the policy rates of major European economies are also higher than Japan's. Therefore, if observed purely from a numerical perspective, Japan's rate hike does not seem sufficient to trigger such widespread attention in global markets. However, financial markets have always focused not on the interest rate level itself, but on the policy direction and economic cycle changes reflected by the interest rate. For an economy that has long been in a zero or even negative interest rate environment, a gradual increase from negative rates to 1% signifies a profound shift in the monetary policy framework that has supported its economy for three decades.
In fact, the reason the Bank of Japan's rate hike has garnered such intense focus from global capital markets is not because the Japanese economy itself has become a global growth engine again, but because Japan has long played an extremely unique yet easily overlooked role in the global financial system – the world's lowest-cost funding center. Over the past two decades, massive amounts of international capital have financed their global allocations of high-yield assets by borrowing extremely low-cost yen funds. From U.S. tech stocks to emerging market bonds, from international commodities to global real estate, almost all risk asset classes have benefited to varying degrees from Japan's long-maintained ultra-low interest rate environment. In other words, Japan not only exports cars, electronics, and industrial equipment but also continuously exports low-cost liquidity to global markets. This liquidity has been a key foundation for the rise in global asset prices over the past two decades.
Therefore, when Japan enters a rate-hiking cycle, what the market is truly concerned about is not whether Japan's interest rate will rise further from 1% to 1.25%, but a deeper question: as the world's largest source of low-cost funding begins to gradually contract, will the global capital allocation logic built on cheap money be redefined?
I. Why Has Japan Maintained Ultra-Low Interest Rates for So Long?
To understand the impact of Japan's rate hike today, one must first go back to the 1990s to understand why Japan has become the most unique entity among major global economies.
In the late 1980s, Japan experienced one of history's most famous asset bubbles. Driven by loose monetary policy and optimistic expectations, Japanese real estate and stock markets rose continuously. Land prices in Tokyo's core areas once reached extremely exaggerated levels, and the Japanese stock market reached a historical high of 38,915 points at the end of 1989. However, the bubble inevitably burst. Entering the 1990s, Japanese real estate prices fell continuously, and the Nikkei 225 Index fell by over 70% in the following decade. Both corporate and household balance sheets were severely impacted.
Unlike an ordinary economic recession, the problem caused by an asset bubble bursting is not just a slowdown in economic growth, but more importantly, a change in the entire society's risk appetite. Corporations began prioritizing debt repayment over investment expansion, households tended to increase savings over consumption, and the banking system was under long-term pressure from non-performing assets. In such an environment, even as financing costs continued to fall, it was difficult to reignite economic vitality.
Facing persistently weak economic conditions, the Bank of Japan began to lower interest rates continuously. According to historical data from the Bank of Japan, Japan's policy rate remained between 6% and 9% for a long time in the 1970s. However, with the economic adjustment after the bubble burst, the interest rate level continued to decline, falling below 1% by 1995, and entering the era of zero interest rates in 1999. In 2001, the Bank of Japan further introduced quantitative easing, becoming the first major central bank to implement large-scale quantitative easing. In 2016, Japan officially implemented negative interest rate policy, lowering the policy rate to -0.1%.
Japan's monetary policy over the past thirty years was not an ordinary cyclical adjustment, but a long-term structural easing. Compared to the frequent rate hikes and cuts in the U.S. economic cycle, Japan's interest rates have shown an almost one-way downward trend, remaining near zero for a long time.
Behind this long-term low interest rate environment actually lies three constraints facing Japan's economic structure.
The first constraint comes from demographic changes. According to statistics from Japan's Ministry of Internal Affairs and Communications, Japan's total population has been declining continuously since peaking in 2008, with the proportion of the working-age population constantly decreasing. An aging population means slower growth in consumption demand, higher savings propensity, and a decline in potential economic growth rates. When the economy lacks demand expansion from new population growth, investment returns naturally decline, and interest rate levels struggle to remain high.
The second constraint comes from the long-term low inflation, even deflationary environment. Between 1998 and 2020, Japan's core CPI average growth rate was less than 1%, far lower than major European and American economies. In most years, Japanese corporations were more worried about products not selling than about rising raw material costs. This environment led to a lack of pricing power and willingness to expand investment.
The third constraint comes from the scale of government debt. According to International Monetary Fund (IMF) data, Japan's government debt currently exceeds 250% of GDP, one of the highest among major developed economies. If calculated based on the current U.S. interest rate level above 4%, Japan's fiscal system would bear an extremely heavy annual interest burden. Therefore, ultra-low interest rates have gradually become not only a tool to stimulate the economy but also an important foundation for maintaining the stable operation of the fiscal system.
In other words, Japan's long-term low interest rates were not an actively pursued goal but an equilibrium state formed under the combined effects of low growth, aging, and high debt. Over the past thirty years, the Japanese economy has effectively relied on ultra-low financing costs to sustain its overall operation, and the market gradually formed a consensus that Japan would remain in a zero-interest-rate era for a long time.
However, this consensus began to loosen after 2022.
II. Why is Japan Re-entering a Rate-Hiking Cycle?
For a long time, the market generally believed Japan was the major economy least likely to enter a rate-hiking cycle globally. Even as the U.S. Federal Reserve underwent multiple rounds of rate hikes and cuts over the past decade, Japan maintained interest rates near zero. Therefore, when the Bank of Japan ended its negative interest rate policy in 2024 and gradually began hiking rates, many investors initially saw it as a symbolic adjustment rather than a genuine shift in monetary policy direction.
But as time went on, the market gradually realized that Japan's current rate hikes are grounded in deeper economic fundamentals.
Firstly, the inflation environment changed.
Over the past twenty-plus years, Japan's biggest macroeconomic problem was deflation. Corporations worried about falling product prices, consumers were accustomed to waiting for lower prices, and the entire economy lacked sustained price increase expectations. However, after the pandemic, global supply chain restructuring, rising energy prices, and changes in the international trade environment jointly pushed the world into a high-inflation cycle, and Japan also began to experience sustained price increases.
According to data released by Japan's Ministry of Internal Affairs and Communications, Japan's core Consumer Price Index has remained above the Bank of Japan's 2% target level for multiple consecutive quarters. Although Japan's inflation level is not particularly high compared to Europe and the U.S., for Japan, which has long been in a low-inflation environment, this already constitutes a significant change.
However, what the Bank of Japan is truly focused on is not inflation itself, but whether wages can grow synchronously.
Historical experience shows that if price increases are only driven by imported energy and food costs, without a synchronous improvement in household income, inflation will eventually suppress consumer demand, which is detrimental to economic growth. Therefore, the Bank of Japan has long emphasized the importance of the so-called "wage-inflation virtuous cycle."
And this cycle has begun to emerge in recent years.
According to the results of Japan's Spring Wage Negotiations (Shunto), wage increases reached 5.1% in 2024, further rising to 5.2% in 2025, and about 5.26% in 2026, exceeding 5% for three consecutive years, the highest level in decades. Meanwhile, data from Japan's Ministry of Health, Labour and Welfare shows that nominal wages in April 2026 increased by 3.5% year-on-year, and real wages also achieved consecutive growth.
The importance of this data goes far beyond the surface numbers.
For the past thirty years, Japan has been unable to form a positive cycle between wage growth, consumption expansion, and corporate profit improvement. Corporations were unwilling to raise wages due to insufficient demand; households were unwilling to consume due to slow income growth; the economy thus stagnated long-term. The current sustained improvement in wage growth means the Japanese economy is showing the first possibility of breaking free from a deflationary mindset.
In addition, exchange rate factors have also become an important reason for promoting rate hikes.
During the period from 2022 to 2025, the U.S. Federal Reserve maintained high-interest rate policies, and the interest rate differential between the U.S. and Japan continued to widen. The USD/JPY exchange rate rose from around 110, once approaching the 160 level. Although yen depreciation is beneficial to export company profits, it also significantly increases Japan's import costs for energy and food. For Japan, which is highly dependent on imported resources, sustained depreciation is not purely beneficial.
Data shows that the Japanese government intervened multiple times in the foreign exchange market in 2024 to stabilize the exchange rate, with cumulative intervention exceeding 11 trillion yen. However, even so, the yen remained weak. This indicates that relying solely on exchange rate intervention can no longer fundamentally change market views on the yen.
Therefore, beginning in 2024, the Bank of Japan's gradual exit from negative interest rate policy and entry into a rate-hiking cycle was not solely in response to inflation but a policy adjustment made under the combined influence of improving wage growth, changing economic structure, and exchange rate pressure.
More importantly, this change not only affects Japan's domestic economy but also begins to impact the most important capital flow chain in global capital markets – the yen carry trade.
III. The Yen Carry Trade: The Invisible Engine of Global Liquidity
If viewed solely from the perspective of Japan's domestic economy, the Bank of Japan raising interest rates from negative values to 1% does not seem sufficient to trigger such widespread global market attention. However, when one shifts perspective from Japan itself to global capital flows, it becomes clear that Japan has actually played an extremely important role over the past two decades – the world's lowest-cost funding center. The key to understanding this lies in grasping the operating logic of the yen carry trade.
The core principle of the carry trade is not complicated; it involves using interest rate differentials between countries for financing and investment. When one country's financing cost is significantly lower than another's, capital naturally flows from low-cost regions to high-yield regions, creating cross-border arbitrage opportunities. Over the past twenty-plus years, Japan has long maintained interest rates near zero or even negative, while the United States, Australia, New Zealand, and some emerging markets offered significantly higher yields. This interest rate differential created huge arbitrage space for global capital.
For example, suppose an international hedge fund can borrow 10 billion yen in Japan at a cost close to zero, convert it to U.S. dollars, and purchase U.S. Treasury bonds yielding 4% to 5%. Then, disregarding exchange rate fluctuations, the interest rate differential alone can generate stable profits. If leverage tools are used to amplify the investment scale, the return can be further increased. Therefore, for large global investment institutions, Japan's long-term ultra-low interest rate environment is not merely a monetary policy phenomenon but a continuously available financing dividend.
Starting after 2000, as Japan's zero-interest-rate policy gradually normalized, massive international capital began using the yen as a global funding currency. According to Bank for International Settlements (BIS) statistics, the yen has long ranked among the top three currencies in global foreign exchange trading volume, and a considerable portion of these transactions do not serve Japan's real economy but rather international capital allocation needs. For many international institutions, borrowing yen, selling yen, and buying dollar-denominated assets has become an extremely mature and highly standardized investment strategy.
In fact, an important reason the yen carry trade could exist for so long is that the market formed a stable expectation that Japan would not raise interest rates significantly. In financial markets, the interest rate differential alone does not guarantee successful arbitrage; exchange rate stability is equally important. If the funding currency appreciates significantly, investors may suffer losses when converting back to the funding currency. Therefore, the reason investors dared to continuously borrow yen over the long term is that they believed the Bank of Japan would not easily change its ultra-loose policy, and the yen would not experience sustained sharp appreciation.
This stable expectation gradually made the yen one of the world's most important funding currencies. In a sense, Japan not only exports goods and capital but also continuously exports liquidity to global markets. When international investors borrow cheap yen to purchase U.S. tech stocks, European bonds, emerging market stocks, and global real estate, Japan has effectively become the underlying funding source for the global leverage system.
Looking back at the process of global asset price increases over the past two decades, one finds it almost always accompanied by an ultra-low financing cost environment. After the 2008 global financial crisis, the U.S. Federal Reserve released dollar liquidity through quantitative easing, while Japan continued to maintain interest rates near zero, providing a constant source of low-cost funding for global markets. In the models of many international investment banks and macro funds, Japan's financing cost is even regarded as a nearly permanent market condition.
However, any trading system built on long-term stable expectations has a common characteristic: once expectations change, the adjustment process is often more dramatic than the establishment process.
In the past, the market believed Japan would never enter a rate-hiking cycle, so it dared to continuously expand carry trade positions. Today, Japan has begun raising rates, so the entire carry trade system must reassess the risk-return structure. This is also why every interest rate decision by the Bank of Japan now receives high attention from global investors.
IV. Why Does Japan's Rate Hike Affect Global Capital Markets?
For many ordinary investors, Japan's share of global GDP has significantly declined compared to the 1980s, and the influence of Japanese stock markets in global capital markets is far less than that of the United States. Therefore, it's easy to have a question: Why does Japan's rate hike affect global markets?
The answer lies not in the Japanese economy itself, but in Japan's special position within the global liquidity system.
The essence of capital market operation is the continuous flow of funds between different assets. One of the important factors determining fund flow is financing cost. When financing costs are extremely low, investors are willing to take higher risks and use more leverage; when financing costs rise continuously, investors tend to reduce risk exposure and decrease leverage.
Over the past two decades, Japan's long-term maintenance of ultra-low interest rates meant global investors could obtain funding at extremely low costs. These funds subsequently flowed into U.S. tech stocks, emerging market assets, commodities, and real estate markets, driving up asset prices. When Japan begins raising rates, this fund flow mechanism changes.
Suppose a global macro fund has long borrowed yen at a cost of 0.25% and allocated the funds to U.S. tech stocks. If Japan's interest rate rises to 1%, the financing cost has actually quadrupled; if it further rises to 1.5% in the future, the financing cost increases sixfold. In absolute terms, 1% and 1.5% may not seem high, but for institutional investors relying on leverage, this means their investment models must be recalculated.
In such a scenario, even if U.S. tech stocks maintain an upward trend, fund managers will reassess portfolio risks because higher financing costs mean lower future returns. When more and more institutions make similar judgments, the market experiences a common phenomenon – deleveraging.
Deleveraging is not simply selling a particular asset but the contraction of the entire funding chain. Investors sell stocks, bonds, and commodity assets, convert funds back to yen to repay loans, thereby reducing overall leverage levels. For a single institution, this is normal risk management behavior. But when a large number of institutions simultaneously engage in similar operations, global markets may experience liquidity contraction.
In fact, similar situations have occurred historically. During the late stages of the 1998 Asian financial crisis and the 2008 global financial crisis, yen carry trades experienced large-scale unwinding. At that time, the yen appreciated rapidly, forcing many investors to cover their funding positions, leading to significantly increased volatility in global markets. Although the current environment differs from historical periods, the capital flow logic remains unchanged.
Therefore, the true mechanism by which Japan's rate hike affects global markets is not through trade or economic growth transmission, but through capital flow and financing cost transmission. When the world's largest source of low-cost funding begins to contract, the entire risk asset system needs to readjust to the new funding environment.
V. What the Market Truly Fears Is Not 1%, but the Change in Trend
As of now, Japan's 1% policy rate remains significantly lower than that of the U.S. and Europe. From this perspective, the market seems to have no need to show such intense focus on Japan's rate hike. However, financial markets are truly sensitive not to current levels, but to future directions.
According to a Reuters survey of economists, most institutions expect Japan's interest rate to reach around 1.25% by the end of 2026 and approach 1.5% in 2027. Numerically, such levels are still not high, but the problem lies in what they represent.
Over the past two decades, global investors built an almost unshakeable consensus: Japan would not enter a sustained rate-hiking cycle. This consensus not only affected market sentiment but also deeply influenced investment models, risk pricing, and asset allocation logic. The very existence of many arbitrage strategies was essentially predicated on this long-standing premise.
Yet today, Japan is gradually changing this expectation.
If in the past the market believed Japan's interest rate ceiling was 0%, that ceiling has now been broken. The future question is no longer whether Japan will raise rates, but to what extent Japan will ultimately raise them.
For the market, this uncertainty is far more important than the interest rate level itself. Because asset pricing essentially depends on future expectations, not current facts. When investors begin to believe Japan may continue raising rates, they will adjust asset allocations in advance, and such adjustments often occur before policies are actually implemented.
More noteworthy is that Japan's economy is currently showing some changes rarely seen in the past thirty years. Improving wage growth, inflation remaining above target, and rising corporate profitability all indicate structural changes in the Japanese economy. If these changes continue, then it is not impossible for the Bank of Japan to further advance policy normalization in the future.
For global capital markets, what truly needs observation is not the next 25 basis point hike, but whether the low-interest-rate era formed over the past three decades is ending. Once the market begins to accept this judgment, global capital flow logic may undergo long-term changes.
VI. The Fed Still Determines the Ultimate Direction
Although Japan is gradually exiting its ultra-loose monetary policy, if one further expands the perspective to the global financial system, it becomes clear that the key variable determining the ultimate direction of international capital flows is still the United States, not Japan.
The reason is that when allocating assets, international capital focuses not on the absolute interest rate level of a single country, but on the relative yields between different markets. For global funds, Japan raising rates from 0% to 1% is important, but if the U.S. maintains interest rates above 4% during the same period, the interest rate differential between the U.S. and Japan still exceeds 3 percentage points. In other words, even though Japan has begun raising rates, U.S. assets still hold considerable attractiveness for international capital.
This is also why, after Japan's consecutive rate hikes and exit from negative interest rates over the past two years, the yen has not experienced the significant appreciation the market once anticipated. According to foreign exchange market data, USD/JPY remained mostly in the range of 150 to 160 during the 2024 to 2026 period. For a country that has ended negative rates and raised rates consecutively, this performance seems somewhat anomalous. But when viewed within the U.S.-Japan interest rate differential framework, the logic becomes clear.
Over the past two decades, the core driver of the USD/JPY exchange rate has always been the U.S.-Japan interest rate differential. When the U.S. enters a rate-hiking cycle while Japan maintains low rates, capital tends to flow into dollar assets, and the yen tends to depreciate; when the U.S. cuts rates while Japan remains stable, the yen often gains support. Therefore, exchange rates essentially reflect not just the strength of one economy but, more importantly, global capital's comparison of yields across different markets.
In fact, the Bank of Japan itself is well aware of this. Over the past few years, the Bank of Japan has repeatedly emphasized in public statements that its policy goal is not to actively push the yen higher but to maintain economic and price stability. From a practical standpoint, even if Japan hopes to improve exchange rate performance through rate hikes, it cannot unilaterally determine market direction. As long as U.S. interest rates remain significantly higher than Japan's, global capital will still tend to allocate to dollar assets.
Therefore, the truly noteworthy question for the coming years is not whether Japan's interest rate can reach 1.25% or 1.5%, but whether Japan's rate hikes and U.S. rate cuts will occur simultaneously.
If the U.S. Federal Reserve enters a new rate-cutting cycle in the future while Japan continues to advance rate normalization, the U.S.-Japan interest rate differential will narrow significantly. This change's impact on global capital flows could far exceed that of Japan's rate hikes alone.
Historical experience shows that whenever monetary policies of major global economies undergo directional changes, international capital reassesses asset allocation logic. For example, in the mid-2000s, sustained Fed rate hikes drove dollar strength; after the 2008 financial crisis, the Fed's ultra-loose policies drove global funds into risk assets. Today, Japan is beginning to raise rates while the U.S. is gradually entering discussions about rate cuts. This combination has not been common over the past two decades, so the market needs to find a new pricing anchor.
For global investors, the most important thing to watch in the coming years may not be Japan's interest rate level itself, but the pace of change in monetary policy divergence between the U.S. and Japan. When the world's largest liquidity provider begins to tighten while the world's most important reserve currency issuer begins to loosen, international capital markets will face a new equilibrium process.
VII. Conclusion
Looking back at the evolution of the global financial system over the past thirty years, Japan's long-maintained zero-interest-rate environment has not only been a domestic monetary policy arrangement but has gradually become important infrastructure for global capital flows. While the U.S. continuously exported dollar liquidity, Japan provided global markets with an almost unlimited source of low-cost funding. Massive cross-border capital used yen funding to allocate global assets, making Japan a crucial funding source for the global leverage system. Therefore, Japan's rate hikes today signify not just an adjustment in one country's monetary policy but a change in an important variable underpinning global asset pricing.
Currently, even if Japan's interest rate rises to 1% or potentially 1.5% in the future, it remains at a relatively low level compared to major European and American economies. Thus, the market is not worried about Japan entering an aggressive rate-hiking cycle in the short term. What truly deserves attention is that the three-decade-old market consensus that "Japan will always provide cheap money" is gradually being broken. When the world's largest source of low-cost funding begins its normalization process, the carry trade systems, capital flow logic, and risk asset pricing models built on ultra-low financing costs may all enter a phase of readjustment. And this is perhaps the most significant long-term change worth noting behind Japan's rate hikes.
