The Discipline of Spending

On Monday 5 October, Japan’s prime minister stood before parliament and promised two things at once. Sanae Takaichi pledged “massive, long-term fiscal expenditure deployed in a well-planned, predictable manner” to draw private investment into growth areas and lift the country’s growth potential. In the same speech, she pledged to “control” bond issuance, review existing tax breaks and subsidies, and act swiftly against market turbulence. “Fiscal sustainability is obviously a prerequisite in pursuing our ‘responsible and proactive’ fiscal policy,” she said, Reuters reported.

The markets heard the second promise and priced the first. The 30-year Japanese government bond yield hit a record 4.235 percent on Monday, Reuters reported, on jitters over the risk of increased debt issuance and on inflation worries fueled by the Middle East war. Japan’s public debt, at roughly twice the size of its economy, is the largest in the developed world. Funding costs are climbing as the Bank of Japan raises interest rates and tapers its bond purchases, weaning the economy off decades of massive stimulus. Takaichi says she will keep a lid on annual issuance, calibrating borrowing to tax revenues, interest rates, debt-financing costs and economic and market developments. The bond market is calibrating her.

The immediate test is already on the table. The government’s first priority in the session is legislation for Takaichi’s two-year cut in the tax on food from next April, a plan that set off a bond selloff because it lacked detail on how the lost revenue would be replaced, according to Reuters. Ministries, meanwhile, are seeking record spending in next year’s budget.

There is a temptation to read all this as ordinary political double-talk, and it partly is. But it is also something more interesting: the clearest current statement of the dilemma facing every advanced economy with a large debt stock. The old playbook, borrow cheaply forever because your central bank will absorb the bonds, is closing. The new playbook has not been written. Takaichi is trying to write it in real time, in front of traders.

The end of the free lunch

For decades, Japan looked like proof that debt did not matter, at least not in the way textbooks said. The government borrowed enormously. The Bank of Japan bought enormously. Interest rates sat at zero, then below it. Inflation stayed stubbornly low. Economists who warned of a bond-market revolt were refuted year after year, until the refutation itself became the consensus: Japan was special, and its central bank infinitely patient.

That patience is ending, and not because of anything Takaichi did. Rising rates, inflation and the Bank of Japan’s own move away from stimulus have repriced Japanese debt. The 30-year yield at 4.235 percent is not a panic. It is a market doing what markets eventually do: asking what the fiscal path looks like when the central bank steps back. Takaichi’s answer, that she will spend massively but borrow responsibly, is less a contradiction than a recognition that the two goals now compete for the same scarce resource, which is investor confidence. Her speech put a target at the center of that answer: to bring down the ratio of national and local government debt to GDP steadily, managing the primary balance over several years rather than year by year, according to the text of the speech published by the prime minister’s office.

The deeper problem is the one she named most starkly. “Population decline is a national crisis that advances quietly,” she told parliament, and she promised a comprehensive population strategy around the end of the year, setting out projections of the country’s demographic future and the measures to meet it. The phrasing is worth sitting with. Crises are supposed to be loud. Japan’s is quiet because it happens one empty classroom and one closed maternity ward at a time, until the fiscal math quietly breaks: fewer workers, more retirees, a tax base that shrinks while pension and health obligations grow. No amount of “proactive” fiscal policy fixes the denominator.

What Tokyo is really testing

Strip away the rhetoric and Takaichi is running an experiment the whole developed world is watching. Can a government with debt at about twice GDP, a shrinking population and a normalizing central bank still use fiscal policy as a growth tool? When borrowing was nearly free, the answer seemed easy. The honest 2026 answer is: nobody knows, and Japan gets to find out first.

The optimistic case is that Japan has buffers other heavy borrowers lack, and that targeted spending on productivity, childcare and labor force participation can raise the growth rate enough to stabilize the ratio. The pessimistic case is arithmetic: if borrowing costs settle well above the rate at which the economy grows, the primary surplus required just to stand still becomes brutal, and reviewing tax breaks does not get you there.

Takaichi’s formulation, “responsible and proactive,” is doing a lot of work. It concedes that the era of consequence-free borrowing is over while insisting that fiscal policy still has a job to do. Whether both halves can be true depends on something no speech can guarantee: that the spending is genuinely productive rather than merely political, and that the bond market believes the discipline is real before it tests whether it is.

There is a final irony worth noting. For years, Japan was cited abroad as evidence that governments could borrow far more than the textbooks allowed, a talking point that turned up in stimulus debates from Washington to Brussels. Japanese policymakers lived with the demographic math. Now the demonstration may run in reverse. If Takaichi can bring debt down relative to GDP while the population shrinks and rates normalize, she will have written the manual for the indebted 21st century. If she cannot, the lesson is harsher but equally instructive: the free lunch is over, and the bill is denominated in bond yields. Japan spent decades teaching the world that debt did not seem to matter. It may spend the next ten teaching the opposite lesson, which would be the more valuable contribution.

Sources

Takaichi’s pledges on spending, bond issuance, tax breaks and market turbulence, the quotations in English from her speech, the record 30-year yield, the description of Japan’s debt and the Bank of Japan’s policy, the food-tax bill and the budget requests are from Reuters’s report of 5 October. The debt-to-GDP target, the multi-year management of the primary balance, the remark on population decline and the promised population strategy are from the Japanese text of the policy speech published by the prime minister’s office; the translation of the population remark is this publication’s. An official English translation of the speech had not been published when this was written. The historical account of Japan’s zero and negative interest rates and low inflation is general background and was not checked against a specific source for this piece.