Ask any tourist who just came back from Tokyo and they’ll rave about the bargains. A dollar that once bought about 80 yen now buys more than twice that, and Japan has become the clearance rack of the developed world. Fifteen years ago the same trip was a painful splurge; today it’s a steal. Yet all that cheapness is not a victory — it’s the symptom of a currency in flight.
Japanese authorities have been dragged back into the markets again and again to prop the yen up, most recently leaning on the U.S. government for help. Every intervention is a mowing of the lawn: it cuts the grass, praises itself, and a week later the weeds are back. What Japan needs is not more days on the mower. It needs the Bank of Japan to do the one thing that actually moves the exchange rate — raise interest rates.
The yen’s slide tracks a widening gap between what markets expect of the Federal Reserve and what they expect of the BOJ. Since the war in Iran began in late February, investors have priced in a more aggressive Fed while assuming Tokyo will stay timid. The 2-year Treasury yield has climbed from 3.39% to roughly 4.25%; Japanese 2-year yields have crept up far more slowly. The gap between the two has widened to about 2.8 percentage points, and over that stretch the yen has lost nearly 5% against the dollar. The arithmetic is not mysterious: when holding dollars pays far more than holding yen, money moves.
Don’t expect the fiscal side to rescue the currency. Prime Minister Sanae Takaichi is a born spender in the mold of Shinzo Abe, and she has just announced a sharp cut to consumption taxes on food. That is politics, not austerity, and it will not support the yen. So the burden lands squarely on the central bank.
The excuse-making has already begun. Higher rates, goes the worry, would crush a government debt load of roughly 200% of gross domestic product. It is a tired bogeyman. Net of the government’s enormous stock of financial assets, Japan’s debt is about half that, and Capital Economics projects it below 80% by 2028. More to the point: the surest way to blow up Japanese finances is to let market confidence in the yen collapse. A prime minister who has spent years leaning on the BOJ for loose money should now see that defending the currency is the growth story’s best friend.
Inflation, meanwhile, gives the BOJ all the cover it needs. Headline consumer prices rose 1.7% in June from a year earlier, and the bank itself expects the number to climb past its 2% target as oil prices bite and a weak yen inflates the cost of imported energy. The BOJ kept its policy rate at 1% at its last meeting — after hiking in June — but holding still in September would be a choice to watch the currency bleed.
Should the Fed move in mid-September, as the market expects, the BOJ’s own meeting a few days later becomes a test it cannot dodge. Washington’s talk of buying $5bn–$10bn of yen, a plan first reported here on Main Street Independent, is whatever its backers claim — and still just another mowing of the lawn: supportive, temporary, and no substitute for the real fix. The only durable arrest of the yen’s decline is a rate hike from the Bank of Japan. Stop mowing. Raise rates.