Bank of Japan Can Stomach Weak Yen

Japan has always been an exceptional nation. Its response to the global inflation wave is no different.

As central banks across the western world have tightened monetary policy, the

Bank of Japan

8301 -0.40%

has stood alone, insisting that its extraordinarily loose policy settings will remain in place. In June, BOJ Gov.

Haruhiko Kuroda

reiterated that his yield-curve control policy, which caps the yield on 10-year Japanese government bonds at 0.25%, would remain in place.

The growing gap between those rates and what is available on other global currencies—10-year U.S. Treasurys currently yield 3.29%—has resulted in an extremely weak currency. One U.S. dollar now buys around 144 yen, up from 115 at the start of this year—an exchange rate not seen since the late 1990s.

Should this be a concern for Japan? A weak yen increases costs of imports, including energy supplies, thus feeding into inflation pressures and hitting corporate profits. But the impact looks manageable for two key reasons.

First, inflation in Japan remains quite mild by current standards. In July, the country’s consumer-price index was up just 2.6% from a year earlier, compared with 8.5% in the U.S. What is more, Japan-watching economist Richard Katz says that 88% of Japan’s inflation over the past three months came from volatile food and energy prices, compared with 39% in the U.S. This gives the BOJ some room to argue that inflation in Japan could prove more transitory than elsewhere.

Second, the weak yen’s drawbacks for corporate Japan are at least offset by its benefits, including higher profits from exports and overseas subsidiaries when translated into yen terms. In a note on Aug. 2,

Marcel Thieliant

of Capital Economics estimated that the yen’s depreciation so far—to around 132 against the dollar at that point—would have a net positive impact on corporate profits worth around one trillion yen, equivalent to $6.9 billion, or roughly 0.2% of gross domestic product.

Standing pat as the yen craters could end up being an audacious final act in a tenure full of them for Gov. Kuroda: His second five-year term ends next April. Goldman Sachs said in a note that its Japan economists expect the yield-curve control policy to remain in place at least until then. This, of course, suggests new uncertainty around the BOJ’s stance could start to creep in early next year. But for now, don’t expect it to flinch at the cratering yen.

How have China, Mexico and Greece handled inflation, and where does the U.S. fit in? WSJ’s Dion Rabouin explains.

Write to Aaron Back at

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