On June 3, 2026, the yen’s real effective exchange rate fell to its lowest level since Japan adopted a floating exchange-rate regime in 1973. This indicator — the currency’s true purchasing power, weighted by each country’s trade volume and stripped of inflation differentials — has touched a historic low that points not to a short-term currency fluctuation but to a slow erosion of purchasing power advancing under the guise of a “natural rate of growth.” On the same day, the yen’s nominal rate slid once more to 160 yen per U.S. dollar.
Two “New Lows,” Two Different Meanings
Market participants are more familiar with the nominal figure of 160 yen to the dollar — the rate had already touched 160.7 yen on April 30, when the Japanese government and the Bank of Japan intervened in the currency market, buying yen and selling dollars to push the rate briefly back into the 155 range. Five weeks later, the effect of that intervention has been fully absorbed.
But the new low in the real effective exchange rate is a more fundamental signal. According to Bank for International Settlements data cited by Nikkei Asia, on a 2020 baseline of 100, the yen’s current real purchasing power is lower than that of the Turkish lira — suggesting that the anchor of currency value between “developed economies and emerging markets” may be undergoing a structural shift.
The real effective exchange rate measures “how many goods and services one unit of yen can buy around the world.” At its current position — the worst in the world — the same sum of yen can purchase fewer imported goods and services, such as oil, food, and semiconductors, than at any point in the past 48 years.
1973, during the oil crisis; the 1990s, after the collapse of the bubble economy; and 2008, in the wake of the Lehman crisis — each was considered an extreme stress test for the Japanese economy. Yet the yen’s real purchasing power today is lower than in all of those periods combined.
From Currency Indicators to the Shopping Basket — The Micro-Transmission of Purchasing-Power Erosion
The most tangible “growing pains” of a weakening yen fall on everyday consumption. According to a special correspondent for the Global Times based in Japan, prices of frequently purchased items in Tokyo supermarkets — olive oil, bread, coffee, chocolate, beef — have continued to rise. A few hundred yen added to a single item may not catch the eye, but the cumulative effect on a monthly food budget is considerable: a bag of coffee beans one correspondent has bought for years has climbed from 1,780 yen per 200 grams to 2,160 yen.
Imported goods have risen especially sharply — the classic transmission path under a floating exchange-rate regime: a weaker domestic currency drives up import costs, which in turn push up the price of consumer goods at the shelf. For Japan, a country heavily dependent on imports of energy and food, this transmission chain offers almost no buffer.
The erosion of purchasing power is spreading from the dinner table to cross-border consumption: families with students studying abroad are trimming their education budgets as currency-exchange costs soar, while the burden of cross-border spending on ordinary citizens has grown markedly heavier. Nominal incomes are unchanged, yet real purchasing power keeps shrinking — for individuals, the lived sense that “my income is the same but everything costs more” often lands with greater emotional force than any macroeconomic signal in the data.
The Structural Dilemma of Not Daring to Raise Rates
The deeper predicament behind the yen’s decline lies in the extremely narrow room Japan has for monetary-policy choices.
In theory, the Bank of Japan could curb the depreciation by raising interest rates. But a rate hike would drive up the servicing cost of Japan’s astronomically large government debt and could also interrupt the recovery now under way in domestic corporate investment appetite. Especially with the Iran war pushing up global energy prices and imported inflation already raising production costs for companies, the contraction in demand that a rate hike would trigger could prove more destructive than the inflation itself.
And so the Japanese economy is trapped in a circular-logic predicament:
Unable to raise rates → the yen keeps falling → imported inflation intensifies → even less able to raise rates
The Bank of Japan’s room to maneuver is steadily compressed by this loop. Persistent currency weakness worsens imported inflation, pushing up corporate production costs and squeezing profit margins; a continued outflow of capital further erodes international confidence in yen-denominated assets.
In the short run, a weaker yen boosts Japan’s export competitiveness — export-oriented firms in autos, components, and machinery are the direct beneficiaries. But the long-term structural costs — rising corporate production costs, a declining national standard of living, and a weakening appeal of yen-denominated assets — are virtually unsolvable under the constraint of “not daring to raise rates.”
Put plainly, it measures how many goods and services one unit of yen can buy around the world. The yen’s current reading on this indicator is the worst in the world, which means the same sum of yen can purchase fewer imported goods and services — oil, food, semiconductors, and the like — than at any time since Japan adopted floating exchange rates.
The Position Reversal With the Turkish Lira
Bank for International Settlements data show that the real effective exchange rates of the yen and the Turkish lira have already reversed positions. The lira has turned to appreciation, gaining 7% since the start of the year.
For years, the Turkish lira has been the textbook example of “the world’s most fragile currency” — chronic depreciation, high inflation, unconventional monetary policy. And now the yen’s real purchasing-power performance has slipped below the lira’s. This is less a story of what Turkey “has achieved” than of what Japan “is becoming” — an economy famed for its “stability” has, in terms of currency purchasing power, slid down to the point of being grouped within the “high-risk emerging-market” band.
The real effective exchange rates of the yen and the Turkish lira (2020 = 100) reversed positions in early 2026. The lira has appreciated roughly 7% since the start of the year, while the yen has continued to weaken, so that the yen’s global purchasing power now shows a weaker trend than the lira’s.
Of course, whether the yen’s “record low in the real effective exchange rate” is a structural long-term trend or a cyclical undervaluation depends on whether Japan can find a monetary-policy equilibrium that does not trigger systemic risk. But given the policy space currently available, the question Japan faces is not “whether to adjust” but “how much damage must be absorbed before it can adjust.”
The Battle for the 160 Stronghold — The Largest Intervention in History and the Entry of the U.S. Treasury
On July 31, the yen staged the most intense bull-versus-bear battle of the floating-rate era. The Bank of Japan is estimated to have committed US$53 billion in a single day — the largest currency operation in history — pulling the yen back from a four-decade low and setting it on course for its biggest weekly gain since February. Nikkei estimated the scale of the intervention may have reached 6 to 7 trillion yen.
The Weibo commentator Bao Rong Wan Wu Heng He Shui (包容万物恒河水) called this battle “the fight for the 160 stronghold”: first came “the Bank of Japan is now defending the 160 stronghold to the death,” then “160 didn’t hold — the U.S. forces and the Japanese housewives have both charged in.” One hundred sixty yen to the dollar is both a technical threshold and a psychological line of defense. What made this intervention unusual was the counterparty: not just market short-sellers, but also “yesterday the United States conducted a rate check, and today it is telling banks to get ready” — the U.S. Treasury, through the Federal Reserve Bank of New York, notified banks that it might intervene in the yen market on Friday (U.S. time), asking them to “prepare for future action.” It would be the first U.S. intervention in the yen market since 2011.
Heng He Shui’s rhetorical question exposes the absurdity of this battle: Japan spends US$53 billion in a single day to defend its currency, and the United States prepares to intervene for the first time since 2011 — yet the label of “currency manipulator” is one Washington has long pinned on others. The chain of carry trades makes the ripple effects of this intervention reach far beyond Japan and the United States: funds that borrowed hundreds of billions of cheap yen to prop up American equities and cryptocurrencies are forced to unwind as the yen strengthens — a stronger yen means unwinding the carry trade, and unwinding the carry trade means capital fleeing U.S. stocks and crypto markets.
Echoing Washington’s entry was unusual movement in U.S. Treasuries: the yield on the 30-year Treasury rose to 5.27%, its highest since June 2007 and up a cumulative 450 basis points from its 2020 low — at the current pace, the 30-year mortgage rate could exceed 7.50% by year’s end. That the yen intervention battle and the spike in long-end Treasury yields occurred in the same week is no coincidence: the elevated yields on dollar assets are themselves one source of downward pressure on the yen, and when the yen strengthens on intervention, the Treasury market in turn becomes the exit through which carry trades are unwound.
Whether the “160 stronghold” holds will be decided by the U.S. Treasury’s moves in the coming days — but whatever the outcome, this episode has already turned the question of “hemorrhaging purchasing power” from a matter of economic discussion into hard cash on the central bank’s balance sheet.
Bessent’s Yen-Long Notes — A New Player at the Intervention Table (Incremental Addition, August 1, 2026)
Just as the market was still digesting the Bank of Japan’s US$53 billion intervention — the largest in history — a Reuters camera captured a more subtle detail: U.S. Treasury Secretary Scott Bessent’s notes on buying yen were photographed, reading plainly “buy 5 to 10 billion yen.” When the commentator Shen Yi reposted the image, his tone carried a note of amused surprise — “ha, would you look at that” — one country’s treasury secretary had let his trading notes slip right into a news photograph.
The value of this detail lies not in the figure itself — 5 to 10 billion yen — but in the fact that it transforms the U.S. Treasury’s role from “verbal support” into “committing real money.” Previously, the market knew only that the Treasury had notified banks, via the New York Fed, that it “might intervene.” Now even the secretary’s own long-position notes had surfaced — whether deliberately or through carelessness, the direction of the signal is the same: Washington is not merely paying lip service but genuinely betting on a stronger yen.
Another thread from the same day concerned Jun Mizutani. The table-tennis star — who, for shorting the yen, had been branded a “traitor to the nation” (非国民) by Japanese public opinion — was noticed by Heng He Shui to have “gone back to commentating on table tennis.” In a market where the yen was surging across the board, the most conspicuous figure in the short camp chose to step away. The exit of the bears and the entry of the bulls happened on the same day: before the battle for the 160 stronghold had produced a winner, the lineup of participants had already quietly turned over.
The Bank of Japan spent US$53 billion to defend 160; the U.S. Treasury prepared to intervene for the first time since 2011; and now even the secretary’s personal long-position notes have gone public. The players in this currency battle have expanded from a single contest — “the Bank of Japan versus market shorts” — into a two-tier structure: “the Japanese and American policy authorities versus global carry-trade capital.”
The Hard Evidence of a Joint Move — From Rate Check to the Treasury Secretary’s Notes (Incremental Addition, August 1, 2026)
Guancha.cn’s report at 16:46 turned “has the United States really entered?” from rumor into hard evidence — with details far more complete than the morning version. The report confirmed three key facts: first, at the open-press portion of the Camp David cabinet meeting, a Reuters photographer shot over Bessent’s shoulder an open notebook reading “to-do items” and “buy US$5–10 billion worth of yen”; second, roughly two hours before the photograph was taken, Reuters had already reported, citing people familiar with the matter, that the U.S. Treasury had notified multiple banks it might intervene in the yen market on Friday; third, on Friday afternoon the yen appreciated appreciably against the dollar once more, with the dollar falling from about 158.9 to 157.6 yen — a drop of roughly 0.8%.
The report also filled in the complete mechanism chain: on the New York foreign-exchange market on July 30, the yen climbed from about 162.80 to 157.80 in just 50 minutes — a gain of about 5 yen — and market participants revealed that the Japanese government had carried out a large-scale yen-buying intervention; the yen then briefly drifted back to 159.5–159.9, but surged again after 1 p.m., because acting on instructions from the U.S. Treasury, the Federal Reserve Bank of New York had issued rate checks to multiple banks. Nikkei noted that Japan and the United States intervening in the exchange rate at the same timing is extremely rare.
Bessent’s own attitude was tucked into a Fox Business Channel interview: “The yen looks seriously undervalued. The market will probably come to realize that the yen should be stronger.” He also said he was not worried about the yen’s appreciation against the dollar. Set that remark beside the notebook’s “buy 5 to 10 billion yen,” and the intervention signal could hardly be clearer: it is not just the New York Fed issuing rate checks — the treasury secretary himself has written a long position on the yen into his to-do list.
Nikkei’s characterization is “extremely rare” — the last time the United States intervened directly in the yen was 2011 (already recorded earlier in this page). What makes this instance special is the timing: Japan had just completed the largest single-day intervention in history, worth US$53 billion, and the United States immediately joined in via a rate check. These are not two separate operations each fighting alone, but two executors of the same battle — Japan responsible for lifting the exchange rate, the United States responsible for anchoring expectations.
Two Strikes — Intervention Confirmed Through Kyodo’s Lens (Incremental Addition, August 2, 2026)
The multiple rounds of intervention recorded earlier in this page received official confirmation through Kyodo News on August 2. Kyodo reported that the Japanese government intervened in the foreign-exchange market twice over the most recent two days: after the yen fell to 162 per dollar on July 30, the government intervened for the first time since May of this year, lifting the yen back to 157.97; the scale of that intervention was between 6 and 7 trillion yen (roughly US$38.11 to US$44.5 billion). On July 31 the yen dropped again to 160.2, and in the early hours of Saturday the Japanese side intervened again — the scale has not yet been disclosed — successfully pulling the rate back toward 157.
The value of this report lies in stringing the scattered intervention moves recorded earlier in this page into one coherent timeline: the 50-minute surge from 162.80 to 157.80 on July 30 (the “Hard Evidence of a Joint Move” section), the US$53 billion largest-ever single-day intervention (the “Battle for the 160 Stronghold” section), and Bessent’s “buy 5 to 10 billion yen” notes (the “Bessent’s Yen-Long Notes” section) — Kyodo’s figures confirmed the scale of the first intervention (6–7 trillion yen) and disclosed, for the first time, the second intervention in the early hours of Saturday. Two strikes, escalating in scale, with Washington coordinating: the intervention has shifted from “one-off firefighting” into “sustained combat.”
The Joint Move Made Official — The First U.S.–Japan Joint Intervention in 15 Years (Incremental Addition, August 3, 2026)
The interventions recorded earlier in this page had always appeared in the guise of unilateral Japanese action; on August 3, that veil was pierced. U.S. Treasury Secretary Bessent posted on social media that “the coordinated foreign-exchange intervention by the United States and Japan has effectively contained disorderly moves in the yen exchange rate,” that the Trump administration strongly supports “Japan’s market and monetary-policy measures to correct the significant undervaluation of the yen,” and that he will “not hesitate to participate in further joint intervention”; Japanese Finance Minister Satsuki Katayama confirmed on the same day that Japan and the United States had jointly intervened in the currency market, and said that going forward she, too, will not hesitate to act jointly again.
Aboard Air Force One, Trump stated the position on this joint move even more bluntly: the United States is helping Japan bolster the yen — “this is a demonstration of friendship, and it also benefits the world economy.” Asked why the United States was stepping in to support the yen, he answered, “the yen has kept weakening, and they wanted a little help,” then immediately added a signature improvised flourish — “Japan has always been nice to us, except for Pearl Harbor, when they weren’t so nice.”
Set this official announcement back inside the intervention timeline recorded earlier in this page, and two chronological milestones stand out: this is the first joint intervention in 15 years — since the joint intervention conducted in response to the yen’s sharp appreciation after the Great East Japan Earthquake of 2011; and yen-buying intervention itself is the first in 28 years, since it was carried out as a crisis-fighting measure during the 1998 financial crisis. On international currency markets, yen-buying and dollar-selling dominated, at one point lifting the yen into the 156-per-dollar range — a level last reached in early May of this year, some three months ago. The “Two Strikes” recorded earlier in this page (July 30: 162 → 157.97; July 31: 160.2 → 157) hereby receive their official characterization: that was not the Bank of Japan rescuing the market alone, but a joint operation by the monetary authorities of the United States and Japan.
The US$34 Billion Friday — The Intervention Bill Surfaces (Incremental Addition, August 4, 2026)
The earlier portions of this page recorded the “official announcement” and the “characterization” of the intervention; in the early hours of August 4, Bloomberg — based on an analysis of central-bank reports — supplied the intervention’s “price”: the operations Japanese authorities conducted on Friday in the foreign-exchange market to support the yen may have cost roughly US$34 billion.
Set that figure inside the intervention timeline recorded earlier in this page, and the thickness of the bill is visible at a glance: on Thursday, authorities were estimated to have spent 8.45 trillion yen (about US$53 billion) — if confirmed, the largest single-day intervention in history; on Friday, another roughly US$34 billion. Over two days the combined total approaches US$90 billion, and the market’s response was this: the dollar fell 2.4% against the yen on Thursday, 1.3% on Friday, and another 0.4% on Monday. In other words, what this colossal outlay purchased was roughly 4% of appreciation across three trading days — and at the end of July the dollar had approached 1:164 against the yen, its highest level since 1986.
Finance Minister Satsuki Katayama declined to comment on Friday over whether intervention had occurred; on Monday Japan’s Ministry of Finance issued a statement confirming that the treasuries of the United States and Japan had bought yen on Friday, July 31, to support the currency. With the official confirmation stacked atop Bloomberg’s estimate, the judgment in the “Joint Move Made Official” section gains a fiscal dimension: the U.S.–Japan joint intervention is no longer merely a gesture but a real-money campaign — and the cost of that campaign is accumulating at record-setting, largest-single-day-ever speed.
The earlier portions of this page recorded the escalation of the intervention from “one-off firefighting” to “sustained combat”; this section adds the dimension of the bill: the US$53 billion + US$34 billion intervention cost, the largest single-day record in history, and the limited appreciation the intervention purchased — the scale of the cost set against the marginal effect.
The Price Tag of Friendship — What America Gets From Rescuing the Yen, and Whether It Can Actually Move It (Incremental Addition, August 4, 2026)
The Global Times report has laid Washington’s motives for stepping in on the table: two reasons, each reckoned from its own ledger.
The first ledger is U.S. Treasuries. CNBC, citing veteran industry figures, noted that Japan is the largest foreign holder of U.S. government debt, and that to defend the yen, Japan may need to sell large quantities of Treasuries to raise funds — one of the scenarios Washington fears most. The two sides have therefore repeatedly stressed plans to use the FIMA repo facility: a liquidity tool the Federal Reserve established in 2020 that lets foreign central banks holding Treasuries borrow dollars against them as collateral rather than selling them on the open market. The two countries are using it to signal the market: Japan can obtain dollars without selling Treasuries — “designed to maximize the signaling effect.”
The second ledger is exports. Wang Jia of the Shanghai Academy of Social Sciences pointed out that excessive yen depreciation would enlarge the export-price advantage of Japanese goods, sending more of them flooding into the United States, undercutting Trump’s goal of shrinking the trade deficit and offsetting the effects of tariff policy. Ma Wei of the Chinese Academy of Social Sciences added operational detail: through the New York Fed, the U.S. Treasury deals with investment banks to sell euros and buy yen in the market — without selling dollars directly. Multiple Japanese media outlets read this as the United States being “unwilling to sacrifice the dollar’s strong position.”
Shigehito Nagai of Oxford Economics offered a blunter characterization: the United States agreed to participate in the intervention because it serves the U.S. national interest — a “low-cost” way for America to extend a favor to an ally.
That the favor is low-cost is near-consensus; whether it will work is decidedly not. Brooks of the Peterson Institute for International Economics wrote that foreign-exchange intervention is essentially a confidence game, and that a coordinated U.S.–Japan intervention may ultimately weaken confidence in the yen rather than strengthen it. The market’s immediate response was hardly encouraging: after the intervention the yen briefly returned to the 155 range and closed around 157, but Takahide Kiuchi of Nomura Research Institute noted that the yen weakened again in Asian trading and that the intervention’s effect was not significant; CNBC reported that analysts see slim hope of a yen rebound. The financial-world views compiled by Bloomberg were similar: Wu Yongren of Eastspring Investments said that unless the fundamental problems in Japan’s monetary and fiscal policy are resolved, intervention alone can hardly sustain a reversal of the depreciation; Gerald Gan of Ruide Capital argued that the more often intervention is used, the weaker its effect becomes; and investor Pelham Smithers was blunter still — if the intervention is seen to have failed, a genuine run on the yen could unfold, making the situation worse still.
The report also leaves one political thread. The Guardian reported that analysts believe Trump views Takaichi as an “ideological ally,” and that this was one factor in his decision to support the yen; CNBC speculated that the intervention shows “U.S.–Japan cooperation and partnership have entered a new phase,” and thereby sends a signal to China. Domestic reaction in Japan leaned cold: Shunichi Shuioka, leader of the Constitutional Democratic Party, worried that the joint intervention could “degenerate into mere time-buying” — the roots of the yen’s depreciation lie in the interest-rate gap between Japan and the United States and in the over-expansion of Japan’s fiscal policy, and neither of those problems is touched even once by a single round of intervention.
The earlier portions of this page recorded the intervention’s bill, from “one-off firefighting” to “sustained combat”; this section adds the ledger of motives and effects: why the United States stepped in (two ledgers — Treasuries and exports), how it stepped in (selling euros to buy yen, the FIMA signal), and multiple parties’ judgments on whether the rescue can actually move the market.