What's behind the big shift in Japanese government bonds?

Rising long-term Japanese government bond yields point to growing nervousness about the future – and not just inflation

Japan city
(Image credit: iStock / Getty Images Plus)

There are not that many people still working in investment who can remember a time when Japanese government bond (JGB) yields did not trend inexorably down. They peaked in 1990, just after the bubble began bursting, and declined through most of the following 35 years.

For the entirety of my career, shorting JGBs has been known as the “widow-maker”. No matter how low yields went, they always found a way to fall further, wiping out anybody reckless enough to bet that the bottom had been reached.

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A line graph depicting the yield to maturity of Japan's 30-year government bond from 2006 to 2023, showing a significant increase in yield.

(Image credit: Future)

Long-dated JGBs signal uncertainty everywhere

Still, the higher yields on long-dated JGBs don’t imply that Japanese monetary policy is going to normalise any time soon. Markets are pricing in a very drawn-out adjustment – while the 30-year JGB and the 30-year bund are now in line, five-year yields are still well over a percentage point apart (0.97% vs 2.18%). This long-term distortion in global markets may gradually unwind – which is likely to be bullish for the yen over the long term – but it’s not immediate, or so the market thinks. Whether this may be too sanguine is another matter: if inflation (3.5% in May) remains high, rates should go up faster.

Instead, what long-dated bonds are signalling in Japan and elsewhere is a huge amount of uncertainty. Take the US 30-year Treasury, which now yields 4.8%. This doesn’t seem to be due to fears of runaway inflation in particular, because the 30-year inflation-linked Treasury is yielding about 2.5% (ie, the rate of inflation needed for them to return the same is just 2.3%). Rather, it simply feels increasingly reckless to lock up capital for so long. Investors worry about increased government spending, the potential for large amounts of bond issuance to fund it, politics (at the time of writing, the UK 30-year gilt had ticked up to 5.4%) and much more. They are right to be worried, and current yields still feel like very meagre compensation for those risks.


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Cris Sholto Heaton

Cris Sholto Heaton is an investment analyst and writer who has been contributing to MoneyWeek since 2006 and was managing editor of the magazine between 2016 and 2018. He is especially interested in international investing, believing many investors still focus too much on their home markets and that it pays to take advantage of all the opportunities the world offers. He often writes about Asian equities, international income and global asset allocation.

Cris began his career in financial services consultancy at PwC and Lane Clark & Peacock, before an abrupt change of direction into oil, gas and energy at Petroleum Economist and Platts and subsequently into investment research and writing. In addition to his articles for MoneyWeek, he also works with a number of asset managers, consultancies and financial information providers.

He holds the Chartered Financial Analyst designation and the Investment Management Certificate, as well as degrees in finance and mathematics. He has also studied acting, film-making and photography, and strongly suspects that an awareness of what makes a compelling story is just as important for understanding markets as any amount of qualifications.