Japan's mounting fiscal concerns continue to escalate, with a joint US-Japan currency intervention being labeled a temporary fix that fails to address the root cause, while markets remain wary of risks spreading across borders.
The yen recently experienced a sharp depreciation, prompting coordinated intervention from US and Japanese authorities. However, Bill Campbell, head of the global sovereign and emerging markets team at DoubleLine Capital, views this intervention as merely a "band-aid on a much larger wound"—with Japan's core problem being a fundamental loosening of its fiscal trajectory.
In the latest episode of DoubleLine's Perspectives podcast, Campbell directly compared Japan's current situation to the UK bond crisis triggered by former Prime Minister Liz Truss in 2022. He warned that in today's inflationary environment, the market cost of policy missteps will arrive much faster than in the past.
Intervention is effective, but just a "band-aid"
During the program, host and client portfolio manager Jeff Probst first posed the question: "Just a few days ago, Japan had to intervene in the FX market. What do you see as the fundamental driver of the yen's overall weakness?"
Campbell responded that this intervention was a coordinated effort by US and Japanese authorities, timed strategically to coincide with a dovish signal from Federal Reserve Chair Jerome Powell and a weaker dollar window. The move successfully pushed the dollar-yen rate from above 163 back to around 155. Campbell stated: "From a tactical perspective, this was a notable large-scale bilateral intervention... But historically, attempts to stop currency depreciation are often futile, and if mishandled, they only waste valuable foreign exchange reserves."
He further noted that US Treasury Secretary Scott Bessent intervened quickly due to concerns that if Japan were forced to sell US Treasuries to buy back yen, the pressure would directly transmit to the US bond market. To this end, the Federal Reserve also provided a special repo line, allowing Japan to use its holdings of US Treasuries to obtain dollars without directly selling them. "But I think this is just a temporary solution, a band-aid on a much larger wound," Campbell said. "Japan's massive debt stock continues to expand, and the sustainability of its fiscal outlook remains in doubt."
Fiscal anchor loosening, consumption tax cut adds fuel to the fire
Campbell emphasized that the yen's depreciation and rising Japanese Government Bond (JGB) yields are essentially a vote of no confidence by the market in Japan's fiscal policy.
The root of the problem lies in two factors. First, the subtle loosening of the fiscal anchor. He pointed out that Japan's recent medium-term economic plan shifted the fiscal anchor from "controlling the fiscal deficit target" to "stabilizing the debt-to-GDP ratio." This change, while seemingly mild, is actually dangerous. Campbell explained: "As long as nominal growth is positive, the debt-to-GDP ratio can continue to grow without addressing the underlying spending problem... This doesn't truly solve the fiscal issue."
Second, a significant consumption tax cut. The government led by Sanae Takaichi, aiming to advance its growth agenda, is pushing through parliament a plan to sharply reduce the consumption tax from the current 8% to 1%, scheduled for implementation from April 2027. Campbell noted that this would incur additional fiscal costs, further exacerbating pressure.
Additionally, an early draft of the "Basic Policy on Economic and Fiscal Management and Reform" included language calling for the central bank to coordinate with the government's growth targets, which the market interpreted as potentially undermining Bank of Japan independence. "When you're trying to stabilize a currency, this is a very dangerous approach," Campbell said. Although this language was later revised, the market has already taken note, and there is now growing external pressure for the Bank of Japan to raise interest rates in this environment.
The 'Truss Moment' warning: In an inflationary environment, policy mistakes are more costly
Probst then asked: "In your latest paper, you mentioned the UK's Truss moment—when long-term UK rates surged about 100 basis points in a short period in 2022, the currency weakened sharply, and the policy had to be quickly reversed. Is Japan at or near that moment?"
Campbell's response was direct: "It feels very similar."
In 2022, the Truss government announced tax cuts for high-income earners, planning to expand the fiscal budget deficit. The result was a severe sell-off in the UK bond market, with long-term yields spiking approximately 100 basis points in a very short time, and the pound plummeting. This eventually forced the Bank of England to intervene, and Truss had to swiftly reverse the policy. "Truss discovered this very quickly," Campbell said. "When the UK announced tax cuts for the highest income bracket, expanding the fiscal deficit, the UK bond market faced a violent sell-off, ultimately requiring the Bank of England to step in and the policy to be quickly withdrawn."
Campbell believes this event reveals a deeper structural shift: "We have left a deflationary environment and entered an inflationary one. In an inflationary environment, whether it's a monetary or fiscal policy error, the market reaction will be more direct and immediate."
What is more alarming is the contagion effect. Campbell stressed that the Truss event was not an isolated issue for the UK—the pressure from rising interest rates and currency depreciation spread to other developed markets. He believes this is one reason why Bessent and US authorities were so quick to intervene jointly with Japanese authorities this time. Campbell said: "In the current higher-inflation trend environment, fiscal and monetary policy need to be pursued more conservatively. These mistakes will not only produce rapid knock-on effects in Japan but also across all developed markets—what happens in one market affects others, including the US Treasury market, and this possibility cannot be underestimated."
Japan is one of the largest foreign holders of US Treasuries. Once Japan's fiscal pressures force it to sell US Treasuries to buy back yen, the US bond market would bear the brunt. His conclusion is that fixed-income investors can no longer view these as isolated, single-country stories. The fiscal and monetary policies of developed markets are increasingly interconnected, and investors must closely monitor international developments, not just the Federal Reserve.
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