Reuters treats the yen’s violent swings as a market mystery, scattering war, oil, interest rates, intervention and inflation across separate financial compartments until the system connecting them disappears. Follow the balance sheets and the mystery clears: Japan commands enormous reserves and U.S. assets, yet defending its currency pulls it deeper into interest-rate pressures, Treasury markets, dollar liquidity, imported energy and rising domestic costs. The contradiction isn’t a helpless Japan facing an omnipotent America but a powerful imperial ally whose creditor leverage grows from the same dollar-centered architecture that constrains its monetary choices, while corporations, smaller firms and workers absorb those pressures unevenly. When war and currency shocks start eating the raises workers fought to win, the answer can’t stay trapped inside central banks and trading desks—the struggle has to move through wages, workplaces and organized opposition to the wars sending the bill downstream.
The Market Did It
Reuters opens Karen Brettell’s September 2 report, “Yen gains sharply”, with an unusual confession: the Japanese currency had suddenly jumped against the dollar, and “it was not immediately clear what prompted the move.” The yen had clawed back from a forty-year low after rare joint U.S.-Japanese intervention in July, surrendered roughly half that gain, weakened past 160 again, and then abruptly strengthened. Reuters offers possible explanations—another intervention, a government “rate check,” hawkish Bank of Japan remarks—but never settles on one. The mystery becomes the story.
That uncertainty is real at the level Reuters chooses to examine: traders staring at screens while prices move by the second. Daiwa Capital Markets speculates about a rate check. SMBC weighs whether thin markets made intervention plausible. Mitsubishi UFJ judges the move too small for official action. Scotiabank says the yen lacks a “fundamental underpinning.” Every authoritative voice comes from a bank, trading desk, central bank, or treasury. Workers paying higher prices, households buying imported necessities, unions fighting over wages, and smaller firms swallowing higher costs never receive a speaking role.
Reuters does identify a larger force: the wide gap between U.S. and Japanese interest rates. But the relation arrives as market physics. Higher American returns support the dollar; lower Japanese rates weaken the yen; investors adjust. Nobody has to act except “markets.” Scott Bessent’s support for “decisive” Japanese monetary steps likewise appears as ordinary policy coordination. Why the U.S. Treasury secretary is publicly urging monetary action by another major capitalist state barely registers as a question.
Then Reuters supplies its own missing connective tissue and scatters it across another subsection. U.S.-Iran military strikes are restricting oil supply. Oil prices are rising. Higher oil raises inflation fears. Higher inflation strengthens expectations of Federal Reserve rate hikes. Higher U.S. rates support the dollar against currencies including the yen. Reuters has placed war, oil, inflation, interest rates, currencies, and state intervention on the same page—and still presents the yen’s movement as something whose cause is obscure.
That’s the ideological usefulness of fragmentation. Nothing decisive has to be falsified. War becomes an oil-price story, an interest-rate decision becomes a market signal, currency pressure becomes trader sentiment, and the people absorbing the costs fade from view. Reuters gives the reader nearly all the pieces. What it withholds is the relation that makes them belong to the same process.
A Currency Has a Balance Sheet
The yen’s latest convulsion didn’t begin with Wednesday’s trading screens. On July 31, after the currency had weakened to roughly 164 per dollar, Japan bought yen jointly with the U.S. Treasury. Japan’s Ministry of Finance said the move targeted “excessive volatility and disorderly movements.” Across the broader July 30–August 26 intervention window, Tokyo reported roughly ¥15.4 trillion in foreign-exchange intervention. That total covers the whole period, not just the joint U.S.-Japan operation, so the precise American contribution remains undisclosed. The intervention worked immediately: the yen strengthened toward 155. But by early September it had traded above 160 again.
That reversal matters because the pressure wasn’t produced by one bad trading day. U.S. rates remained far above Japan’s. The Federal Reserve held its target range at 3.5–3.75 percent while the Bank of Japan’s policy rate sat near 1 percent. Higher returns on dollar assets encouraged investors to fund positions cheaply in yen and move capital toward higher-yielding markets. Yet the gap itself doesn’t explain everything. A Daiwa Institute study found that since late 2025 the yen kept weakening even as the U.S.-Japan real-rate differential narrowed. U.S. real rates remained more closely associated with the exchange rate than the bilateral gap alone.
Japan is hardly approaching this problem empty-handed. At the end of July it held about $1.287 trillion in official reserve assets, including more than $900 billion in securities. Japan-based investors also held roughly $1.12 trillion in U.S. Treasury securities at the end of June, making Japan the largest country holder in Treasury’s table. Those figures aren’t the same pool of money: official reserves belong to the Japanese state, while the Treasury total also includes banks, insurers, funds and other Japanese holders. Treating them as one national wallet would obscure who actually owns what.
The plumbing connecting those assets to currency defense is just as important. After the July intervention, Tokyo said it intended to use the Federal Reserve’s FIMA Repo Facility in the future. FIMA allows approved foreign monetary authorities to obtain temporary dollars by pledging Treasury securities instead of selling them outright. The Fed says the facility exists partly to support U.S. financial conditions and avoid disruptive Treasury liquidation. There’s no evidence FIMA financed the July 31 intervention itself; Japan announced prospective use afterward. But the facility shows how yen defense, Japanese Treasury holdings and dollar liquidity can meet inside the same institutional channel.
Washington had reasons of its own to care about the yen. Treasury Secretary Scott Bessent warned in August that disorderly Japanese currency movements could force portfolio unwinds, disturb global markets and raise American borrowing costs. Japan’s problem therefore wasn’t occurring outside U.S. finance. The scale of Japanese dollar assets made instability in Tokyo a potential problem for Washington too.
The obvious alternative—raise Japanese rates faster—comes with its own costs. Japan’s FY2026 budget projects roughly ¥13 trillion in interest payments as old low-rate government debt is refinanced at higher yields. Ten-year Japanese government bond yields crossed 3 percent in early September. That doesn’t mean Japan is on the edge of a debt collapse: the Bank of Japan’s own stress testing still finds the banking system broadly capitalized against higher-rate scenarios. It does mean rate hikes shift pressure from the exchange rate toward public financing, bond prices and interest-sensitive borrowers.
Then there’s oil. The BOJ says Japan obtains more than 90 percent of its crude from the Middle East. As war and shipping disruption intensified, July imports from the region fell 32.8 percent by volume from a year earlier. Japanese import prices jumped 29.1 percent and wholesale prices 7.2 percent in July. A weaker yen magnifies that shock because each dollar-priced barrel costs more in Japanese currency. What Reuters separates into an oil story and a currency story lands on the same corporate invoices and household budgets.
Those costs aren’t distributed evenly. Globally positioned corporations can gain when overseas earnings translate back into cheaper yen, while import-dependent firms face higher fuel, materials and component costs. Workers had meanwhile won average 2026 spring wage increases of about 5 percent. Real wages had begun recovering, yet household consumption remained fragile. The yen was moving through financial markets, but the adjustment was already reaching factories, shops and paychecks.
The yen, then, isn’t moving through an empty market. Behind the quote on a currency screen sit interest rates, speculative positions, Treasury portfolios, central-bank facilities, imported oil, state debt, corporate earnings and wages. Japan possesses enormous financial resources and substantial room to act. But every instrument it uses to defend the currency carries another balance sheet behind it—and another set of people who pay when that balance sheet is adjusted.
The Ally Inside the Dollar Machine
Japan’s problem isn’t that it lacks monetary power. It has plenty of it. The contradiction is that Japanese capitalism built much of that power inside a financial architecture whose central conditions it doesn’t control. Its corporations accumulated abroad, its financial institutions piled into overseas assets, its state amassed enormous reserves, and its currency became one of the most important in the world. Yet when the Federal Reserve changes the price of dollars, capital moves, balance sheets shift, and Tokyo has to decide how much pain it’s willing to absorb defending the yen. Japanese power is real. So is the hierarchy enclosing it.
That’s why “dependency” by itself is too weak a word. Japan isn’t standing outside the dollar system begging for access. Japanese capital is inside the machine helping turn the gears. Its accumulated wealth strengthens the very markets whose movements can constrain Japanese policy. Its giant holdings of dollar assets give Tokyo leverage over Washington precisely because Japanese capitalism is so deeply invested in the financial order centered there. The same integration generates privilege and vulnerability at once. Japan can impose costs on U.S. finance, while U.S. monetary conditions still travel through Japanese markets with a force Tokyo can’t simply legislate away.
This is asymmetric interdependence inside collective imperialism. The United States and Japan are both advanced capitalist powers, both beneficiaries of an international order that protects private accumulation, capital mobility and imperial-core privilege. But they don’t occupy identical positions inside that order. Washington sits at the center of the currency and asset system through which much of the world’s finance moves. Tokyo operates near the top of the hierarchy, with immense room to maneuver, privileged access and enough creditor power that Washington has reasons to accommodate it. Hierarchy here doesn’t look like a colonial governor barking commands at a dependent treasury. It looks like one powerful capitalist state repeatedly adjusting inside a structure another occupies more centrally.
That distinction matters because monetary domination in the imperial core is reproduced as much through privilege as through punishment. Sanctions, blockades and financial exclusion show one face of dollar power. Japan shows another. The system offers liquidity, coordination, intervention support, deep asset markets and crisis insurance to its most important participants. Those benefits are part of what keeps them invested in it. A hierarchy this durable doesn’t survive only because states are forced to remain inside. It also survives because powerful capitals profit there, protect their wealth there and rely on the institutions there when the gears start grinding.
Formal sovereignty survives inside that relationship, but formal sovereignty isn’t the same thing as material freedom of action. Tokyo can print yen. The Bank of Japan can raise or lower rates. The state can intervene in currency markets. None of those powers operates on empty ground. Rate hikes land on public debt, borrowers and asset prices. Low rates affect capital flows and the currency. Intervention touches foreign assets and financial markets. Energy dependence turns distant military conflict into domestic costs. The question therefore isn’t whether Japan is “sovereign” in some constitutional sense. The question is how much room a government actually possesses when every available lever pulls on another part of the social order.
And that social order has classes inside it. “Japan” doesn’t pay for a weak yen. Specific people and firms do. Financial capital can profit from differences in interest rates and exchange values. Globally positioned corporations can benefit from overseas earnings translated back into cheaper yen. Import-dependent firms get hit through fuel, materials and components. Workers meet the same process in a much less glamorous place: the grocery bill, the power bill, the commute, the paycheck. The currency market becomes real in the reproduction of everyday life.
That gives the wage struggle a different meaning. Workers can force capital to concede higher nominal wages and still watch part of that victory get chewed up by prices transmitted through energy markets, currency depreciation and corporate pricing. The bargaining table doesn’t sit outside world finance. It is one place where world finance becomes class struggle. A percentage won in wages can be partially taken back through a barrel of oil priced in dollars, a shipment delayed by war, or an imported input that arrives more expensive because the yen weakened before it reached the factory gate.
War exposes the circuit brutally. Bombs fall in West Asia, oil routes tighten, energy costs rise, inflation pressure increases, central banks contemplate higher rates, currencies move and states begin deciding who will absorb the adjustment. By the time the consequences reach workers, every stage has been translated into the bloodless language of “market conditions.” The violence disappears somewhere between the tanker and the trading terminal. Then the higher price shows up at home as though it were weather.
This is where Reuters’s framing becomes plausible. Traders really don’t always know what caused a sharp move in a given hour. Central bankers really do send signals. Markets really do react to rates, oil and expectations. The lie isn’t necessarily in any one observation. The mystification comes from making those observations the whole reality. Once each relation is chopped into a separate specialist beat, the historical process disappears. War belongs to geopolitics, oil belongs to commodities, wages belong to labor, rates belong to central banks, and currencies belong to traders. The system survives editorially because nobody is required to describe the system.
Put the pieces back together and the mystery fades. Japanese capitalism accumulated enormous strength through deep participation in an international financial structure that also limits the forms that strength can take. Washington possesses disproportionate monetary power, but that power depends partly on foreign creditors like Japan continuing to hold and circulate dollar assets. Tokyo has leverage, but exercising it recklessly can damage the markets where Japanese wealth itself is stored. Capital profits from the relation, states manage its contradictions, and workers absorb a share of the adjustment when prices outrun wages.
So the yen crisis isn’t a story about a helpless Japan or an omnipotent America. It is a story about how capitalist power is organized unevenly among allied imperial states and then distributed downward through class society. Monetary sovereignty under those conditions is more than having a flag on the banknote and a central bank capable of changing a number. It is the material capacity to make economic choices without another currency’s markets, another state’s interest rates, mobile capital, imported energy and your own ruling class constantly rewriting the cost of every option.
That’s the relation Reuters’s “mystery” conceals. And once workers win a raise only to watch war, inflation and currency pressure come back for their share, the yen stops being a problem for central bankers alone.
Don’t Let War Eat the Raise
Workers shouldn’t be handed the bill for a crisis they didn’t create. In Japan, the immediate leverage point is wages: oil shocks, imported inflation and a weak yen raise the price of food, fuel and production, while employers and the state can try to push those costs downward through smaller raises, weaker hiring and higher prices. Zenroren, an independent national labor center, is already organizing on that terrain. Its current wage campaign combines bargaining, minimum-wage demands, support for smaller firms facing higher costs, workplace organizing and pressure on ministries and lawmakers. The point is material: keep currency and energy shocks from becoming cuts in workers’ living standards.
The same contradiction makes antiwar struggle part of the wage fight rather than a separate moral appeal. Zenroren has connected the Iran war to disrupted oil and naphtha supplies, higher material costs, threatened employment and pressure on wages. Its coordinated actions have combined demonstrations, government lobbying and workplace demands. The leverage lies in forcing employers and the state to absorb more of the shock instead of recovering war-driven costs from workers’ paychecks.
U.S. workers have leverage on the other end of the circuit. The United Electrical, Radio and Machine Workers of America—UE—has tied the Iran war to the working-class cost-of-living crisis and called on locals to join demonstrations, build coalitions and pressure elected officials. Workplace education, union resolutions and coalition action can raise the domestic political cost of a war whose consequences move outward through oil markets and return through prices and public budgets.
Mass antiwar pressure can widen that struggle beyond individual workplaces. The ANSWER Coalition has organized multi-city demonstrations against the war. Protests alone won’t determine exchange rates or central-bank policy. Their leverage lies in making continued military escalation harder to treat as costless while unions contest its economic consequences where they land.
The orientation is concrete: defend wages, raise the minimum, organize workplaces, protect workers and smaller firms from employer cost-shifting, and fight the war generating part of the price shock. Currency traders can keep asking what moved the yen on a Wednesday afternoon. Workers should ask the question that matters more: who keeps getting stuck with the bill? Then organize where that bill is being collected.
Weaponized Information 
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