Why investors need to keep watching the yen

Russ Mould
16 April 2025
  • Trump, trade and tariffs threaten stock and bond markets’ dream scenario of cooler inflation, a soft landing and rate cuts
  • Markets’ slide coincides with sharp rally in the yen
  • Japanese currency has been a major source of global liquidity
  • Pressure is on the Bank of Japan as it prepares for policy meeting in May

“Policy statements on trade, the tariffs and the dollar from Washington and Beijing are dominating the headlines, and the attention of stock, bond, commodity and currency markets, but investors must pay heed to what is going on in Tokyo, too,” says AJ Bell investment director Russ Mould.

“A major rally in the yen was fingered as the cause of last August’s brief stumble in share prices around the world and another surge in the Japanese currency is evident now, as financial markets endure another unexpected bout of volatility.

“This may not be a coincidence. The Yen has been a major source of global liquidity, as major market players have shorted it, borrowed against it and used that money to go buy risk assets around the globe.

“They have been able to do so because interest rates in Japan have been so low, much lower than elsewhere, and the Bank of Japan has also continued to run its Quantitative and Qualitative Easing (QQE) programme to a level way in excess of the monetary stimulus applied by central banks in the West.

Source: Bank of Japan, FRED - St. Louis Federal Reserve database, LSEG Refinitiv data

“Cheap yen have therefore been one major source of the tidal wave of cash that has done much to boost share prices worldwide.

“However, interest rates are now on the rise and the Bank of Japan (BoJ) is curbing growth in its balance sheet as inflation finally rears its head in the country after near forty years of disinflation and even outright deflation.

“Inflation is now running at 3.7% year-on-year in Japan, based on the headline consumer price index benchmark, a figure that is almost twice the target sought by Bank of Japan governor Kazuo Ueda and his colleagues.

Source: LSEG Refinitiv data

“The yields on benchmark Japanese Government Bonds (JGBs) have shot higher, to attract capital and thus buyers – not sellers, or shorters – of the yen.

“After three gentle increases in the Main Policy Rate to 0.5%, the highest mark since 2008, the scene is now set for the BoJ’s next policy meeting on 1 May. In theory, Mr Ueda and his team would like to sanction another hike to ensure inflation does not remain sticky and also, perhaps, to appease bond vigilantes who are starting to push policymakers around the world over.

Source: LSEG Refinitiv data

“But rate hikes could attract further capital to Japan, further stoke the yen’s rise and bring three complications.

“One could be the ongoing unwind of the carry trade, as losses on yen shorts by foreigners persuade them to close out their shorts and buy back more yen to fuel further gains in the Japanese currency, to perhaps create a circle every bit as vicious as it had previously been virtuous.

“Another could be how yen gains inflict losses on Japanese holdings of overseas assets, notably US Treasuries, of which Japan is the single biggest foreign owner, with some $1.1 trillion in US government bonds. If Japanese holders start to sell, Treasury prices could go down and yields go up, to further complicate the growth and economic outlook in the USA, in an example of just how inter-linked global financial markets, capital flows and economies now are, whether national leaders like it or not.

Source: LSEG Refinitiv data

“And finally, for Japan itself, yen strength is potentially bad for exports and economic growth, at a time when President Trump’s tariffs are already a potential obstacle to the sale of Japanese goods.

“The yen may therefore have a pivotal role in both the global economy and global financial markets as both continue to feel the reverberations of President Trump’s tariff and trade policies.

Source: LSEG Refinitiv data

“If last summer’s – brief – market squall did indeed have its roots in the yen’s rise, then investors may need to buckle up once more if the Japanese currency maintains its current upward run against the dollar.”

Russ Mould
Investment Director

Russ Mould’s long experience of the capital markets began in 1991 when he became a Fund Manager at a leading provider of life insurance, pensions and asset management services. In 1993, he joined a prestigious investment bank, working as an Equity Analyst covering the technology sector for 12 years. Russ eventually joined Shares magazine in November 2005 as Technology Correspondent and became Editor of the magazine in July 2008. Following the acquisition of Shares' parent company, MSM Media, by AJ Bell Group, he was appointed as AJ Bell’s Investment Director in summer 2013.

Contact details

Mobile: 07710 356 331
Email: russ.mould@ajbell.co.uk

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