Yen Weakness Driven by Inflation, Not Fiscal Woes, BCA Research Says

The Japanese yen's slide to a near 40-year low is being driven by inflationary pressures stemming from the Bank of Japan's loose monetary policy, not by concerns over the nation's public finances, according to a report from BCA Research.

The research firm anticipates that both the yen and Japanese Government Bonds (JGBs) will remain under pressure through the end of 2026, but suggests that investors should prepare to begin accumulating positions in the "severely undervalued" currency this winter.

Inflation at the Core

BCA Research contends that traditional interest rate differentials are no longer sufficient to explain the yen's profound weakness. Instead, the firm points to inflation expectation indicators and the relative steepness of Japan's yield curve as more powerful drivers for recent moves in the USD/JPY and EUR/JPY currency pairs.

With Japan's real policy rate at a -0.75%, BCA describes the current monetary stance as "highly accommodative" even as the economy shows signs of overheating. The firm highlights several key indicators:

• Annual wage negotiations have resulted in gains of over 5% for three consecutive years.
• Credit growth reached 5.7% in June, the fastest pace in over 30 years, excluding the pandemic period.

A Hawkish Turn Ahead

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Looking forward, BCA projects that Japan's headline inflation will rise to 2.7% by June 2027, with core inflation reaching 3.1%. This sustained price pressure is expected to eventually compel the Bank of Japan to adopt a more hawkish policy stance.

Such a shift would likely provide support for the yen and lead to a flattening of the Japanese yield curve. BCA also notes that low volatility in currency and bond markets has fueled yen-funded carry trades, adding to the selling pressure. The large buildup of speculative short positions creates the risk of a sharp rally should volatility increase or if authorities intervene in the market.

Investment Strategy

Based on its analysis, BCA Research has adjusted its strategic recommendations. The firm advises remaining underweight on JGBs through the end of the year and plans to begin building long yen positions during the winter. It has also downgraded Japanese bank stocks to neutral, reasoning that while higher yields initially boost profitability, a future policy shift causing a flatter yield curve could compress lending margins.

BCA states that Japan's high government debt does not pose an imminent fiscal crisis, citing the country's current account surplus, significant overseas assets, and a declining net debt-to-GDP ratio as stabilizing factors.