After more than three decades of economic stagnation, Japan is showing signs of revival, a development that carries significant implications for global financial markets, particularly in the United States. The shift centers on Japan’s $7.6 trillion bond market and the potential reversal of capital flows that have long supported U.S. assets.
Starting in the early 1990s, following the collapse of the country’s asset bubble, Japan entered a prolonged period of low growth and extremely low interest rates. The Bank of Japan (BOJ) implemented a series of aggressive monetary policies, including lowering short-term rates to near zero, engaging in quantitative easing, and adopting negative interest rates in 2016. At their lowest, yields on Japan’s 10-year government bonds were near 0.1 percent, compared with more than 2 percent on comparable U.S. Treasury securities.
This environment encouraged a phenomenon known as the carry trade, where investors borrowed yen at low or negative rates to purchase higher-yielding foreign assets, including U.S. stocks and bonds. The result was a steady flow of Japanese capital into American financial markets, estimated at $2.8 trillion in U.S. equities, bonds, and other assets as of mid-2025.
Recent developments, however, suggest this dynamic may be shifting. In 2024, Japan’s government bond yields rose to nearly 3 percent—the highest level in decades—reflecting stronger economic growth and increased government spending. This change has sparked concerns about a potential reversal of the carry trade, as investors might repatriate capital to Japan to take advantage of higher domestic returns.
The impact of such a move could be substantial. The unwinding of Japanese investments in U.S. assets may push up Treasury yields and exert downward pressure on the dollar, complicating the economic strategy of U.S. policymakers. In the summer of 2024, the yen weakened sharply against the dollar, prompting intervention by Japan’s Finance Ministry and the BOJ. In response, the BOJ raised interest rates and indicated potential further hikes, while also signaling a reduction in bond purchases.
Efforts to manage these market pressures have included discussions about asking Japan’s Government Pension Investment Fund—one of the largest asset managers globally with $2.1 trillion under management—to shift some investments from foreign bonds back to Japanese government securities. While this could help stabilize Japanese yields, it would likely contribute to volatility in U.S. markets, particularly by increasing U.S. Treasury yields.
U.S. Treasury Secretary Scott Bessent has engaged in unprecedented measures to coordinate with Japanese officials, aiming to address currency and bond market challenges without triggering large-scale asset sales that could disrupt American markets.
Though a rapid and large-scale repatriation appears unlikely in the short term, the possibility of gradual capital outflows presents a new risk for U.S. financial stability. Japan’s stock market has surged nearly 30 percent in 2024, substantially outperforming the S&P 500, further increasing the attractiveness of domestic investment.
For years, investors struggled to anticipate shifts in Japanese bond yields, earning the carry trade the nickname the “widow maker” for its unpredictability and high risks. With Japan's economy showing renewed momentum, global markets now face the challenge of adapting to a potential transition that could redefine investment patterns between two of the world’s largest economies.