NextFin News - The yen’s weakness is still being measured in the foreign exchange market, but BNY’s point is that the real damage now shows up in the price of everyday spending. A curry dish, not a Big Mac, can be the cleaner signal because it sits closer to Japan’s local food-cost mix, where imported ingredients, energy and labor meet a currency that has spent recent weeks near 159 yen per dollar in the Federal Reserve’s H.10 data.
That matters because the Bank of Japan is no longer pretending the exchange rate is separate from inflation. On June 16, the BOJ raised the interest rate applied to the complementary deposit facility to 1.0 percent and the basic loan rate to 1.25 percent. In the same policy statement, it said that, given underlying CPI inflation approaching 2 percent and accommodative financial conditions, it will continue to raise the policy interest rate and adjust the degree of monetary accommodation in response to economic activity, prices and financial conditions. In other words, the central bank is already inside a normalization cycle, and the currency is testing how far that cycle has to go.
By the end of July, the yen had still not escaped the pressure. The Federal Reserve’s H.10 series put the dollar at 159.16 yen on July 31, after 159.47 on July 30 and 163.86 on July 29. That is not a straight-line collapse, but it is enough to keep import pricing elevated and to force investors to ask a more pointed question: is the yen just moving inside a cyclical range, or has Japan entered a regime where a weaker currency feeds more quickly into domestic prices?
The BOJ’s own education material defines a weak yen simply: fewer units of foreign currency can be exchanged per unit of yen. The policy problem starts there and then moves one step further. If a weak yen makes imported food, fuel and industrial inputs more expensive, companies can either absorb the hit or pass it through. When wages and general prices are already moving up, the incentive to pass it through rises. That is why the exchange rate has become more than a trading variable. It is a transmission mechanism.
The curry comparison is useful precisely because it is not universal. Big Mac-style purchasing-power comparisons are broad and convenient, but they can flatten the channels through which exchange rates hit local consumers. A curry dish can reveal something more specific about Japan, where local consumption depends on a mix of imported ingredients, domestic labor and energy costs. If the yen weakens, the damage does not land evenly across all items. It shows up first where import content is highest and where sellers have enough pricing power to pass through the shock.
What The Currency Is Telling The BOJ
The first judgment is straightforward: the current weakness is still cyclical at the level of the exchange rate, but the pass-through into prices is becoming more structural. That split matters. FX levels can reverse quickly. Policy gaps can narrow. Risk sentiment can change. The yen has spent much of the past few years under pressure from the wide gap between U.S. and Japanese rates, and that gap can still move. So the currency itself should not be treated as a one-way street.
The inflation response is harder to unwind. Japan’s policy regime has changed. The BOJ is no longer pinned at zero. It has already lifted its policy settings, and it says it will keep tightening if the outlook holds. At the same time, the bank is openly discussing inflation that is closer to target, not chronic undershooting. That is a different environment from the one that shaped earlier weak-yen episodes. Then, a softer currency was often tolerated as a growth support. Now it is more likely to be read as a cost shock that can erode real income and widen inflation anxiety.
Three historical comparisons make the cyclical-versus-structural call easier. First, in the old deflationary regime, the BOJ could lean far more heavily on easing without worrying that a weaker yen would quickly seep into wage-setting. Second, in prior yen selloffs, imported inflation often faded because domestic demand was too weak for firms to keep raising prices. Third, today’s policy backdrop is different because the BOJ has already moved rates to 1.0 percent on the deposit side and still insists that further hikes remain on the table. Those comparisons suggest the currency level may still mean-revert, but the economy around it has changed.
The second-order effect is what the market often misses. A weak yen does not just make imports costlier. It changes the way the next policy meeting is interpreted. If the BOJ sees the yen as adding to underlying price pressure, then the market may price more tightening even if the currency itself does not strengthen immediately. That means the first asset to react could be JGB yields, not spot FX. The currency move becomes a policy signal, and the policy signal becomes a rates trade.
As for the future conduct of monetary policy, given that underlying CPI inflation has been approaching 2 percent and financial conditions have been accommodative, the Bank will continue to raise the policy interest rate and adjust the degree of monetary accommodation, in response to developments in economic activity and prices as well as financial conditions.
That is the bridge between the exchange rate and the macro story. The BOJ is telling the market that inflation is no longer a temporary import story alone. The weaker yen can still be part of a cyclical FX move, but the bank is treating its effects as a live policy input. That makes the pass-through more durable than the rate level itself.
Why The Food Comparison Matters
The broader lesson is that not all consumer benchmarks say the same thing. A burger index captures generalized purchasing power. A curry dish can reveal something more specific about Japan, where local consumption depends on a mix of imported ingredients, domestic labor and energy costs. If the yen weakens, the damage does not land evenly across all items. It shows up first where import content is highest and where sellers have enough pricing power to pass through the shock.
That is why the food comparison is not just a headline gimmick. It points to the mechanism. Japan’s inflation problem is no longer only about whether consumer prices are rising. It is about where the pressure comes from, who absorbs it, and whether firms and households expect it to persist. If imported cost pressure keeps filtering into restaurant menus, grocery shelves and service prices, then a weak yen stops being an abstract FX move and becomes part of the domestic price-setting system.
The strongest counter-thesis is that this is still mostly a rate-gap story and therefore cyclical. The dollar remains supported by U.S. rates, the BOJ is only slowly normalizing, and any shift in Fed expectations could narrow the gap fast enough to let the yen recover without a deeper structural change. That view is credible. It is also the reason the falsifying signal has to be precise: if USD/JPY falls back materially toward the low-150s while BOJ tightening pauses and inflation cools, then the current weak-yen narrative is still mainly cyclical rather than regime-defining.
But if the yen stays soft even as the BOJ keeps tightening, the currency will be saying something more important than “policy gap.” It will be saying that Japan’s inflation process has become less forgiving of import shocks. That would not require a permanent collapse in the yen. It would require only that each downturn in the currency leaves a larger mark on prices than it used to.
What To Watch Next
Short term, the question is whether the market keeps treating the yen as a fast-moving FX story or starts treating it as a policy input. If the latter wins, JGBs and rate expectations should move first. Medium term, the key is whether BOJ communications continue to link weak-yen pressure with the decision to normalize further. Long term, the issue is whether Japan’s inflation structure has shifted enough that import shocks now arrive faster and stay longer.
The base case is continued volatility: a weak yen, cautious BOJ tightening and periodic attempts by the currency to stabilize when policy expectations move. The upside case for the yen is a sharper narrowing of the U.S.-Japan rate gap or a more hawkish BOJ signal. The downside case is a renewed break weaker if U.S. yields stay elevated and Japanese inflation loses momentum, forcing the bank to slow its pace.
The next clean test is simple: the next BOJ policy message, the next inflation print and whether USD/JPY can hold below the 160 area for long. If the currency weakens without feeding through to domestic prices, the curry comparison will fade quickly. If it keeps showing up in prices, then the market is no longer just watching a weak yen. It is watching a weaker pricing regime.
The yen is still a currency story on the screen, but it is becoming a price story on the street. That is the part the market cannot afford to miss.
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