Japan's Keynesian Mirage: How Debt, Inflation, & A Collapsing Yen Expose A Failed Model

Authored by Daniel Lacalle,

Japan’s yen crisis exposes the long‑running failure of the Keynesian strategy that has dominated the country’s economic policy: chronic deficits, exploding public debt, and engineered inflation are now eroding Japan’s purchasing power, competitiveness, and monetary stability.

For decades, many mainstream analysts pointed to Japan as proof that a rich, “monetarily sovereign” country could keep an extremely high public debt without relevant consequences. The argument was simple: as long as the state can issue its currency, it can always print whatever is needed to cover deficits, refinance debt, and support public spending.

In reality, that has meant public debt soaring to around 250% of GDP, one of the highest levels in the developed world, while repeatedly increasing government expenditure and leaving large, persistent deficits. Even the IMF notes that, even after several years of moderate growth, prudence is “key to keep debt‑to‑GDP on a firmly downward path,” admitting that the current level is a structural vulnerability.

Japan’s apparent stability depended on a crucial external factor, the country’s enormous exporting capacity.

As a leading exporter of cars, technology, and capital goods, the country attracted a continuous inflow of US dollars and foreign capital that supported a stable currency and kept inflation low, despite fiscal excess. That protective layer is eroding fast. Headline inflation has edged up from 1.4% in April 2026 to 1.5% in May, while core inflation has held at 1.4%, still below the Bank of Japan’s 2% target but clearly positive after three decades of near‑zero price growth.

A key factor of the Japanese model was its export engine and the “golden goose” of capital inflows.

These two factors allowed the country to live with large debt and deficits without immediately triggering high inflation. However, that mirage is vanishing as external performance falters and inflation, though moderate, bites into real incomes.

Keynesianism did not spur growth or improve Japanese citizens’ lives. It just bloated an unsustainable government machine.

Recent data show that price increases are now broad‑based, not confined to a few categories. In May 2026, overall CPI inflation was 1.5% year-on-year. However, food prices rose 3.5% year-on-year, which is a heavy burden for households. Goods inflation stood at 2.0%, while services inflation was around 1.0%.

Underlying inflationary pressures, particularly in services and wage‑sensitive sectors, are now embedded in the system rather than an isolated energy shock. Meanwhile, real net wages are stagnant or declining. Japanese citizens face an affordability crisis.

The authorities, obsessed for years with the ludicrous “risk of deflation,” consciously tried to push inflation above zero, aiming to erode the real value of the public‑debt stock. They have achieved modest inflation, but at the cost of real wage erosion. Despite headline gains in nominal pay, inflation‑adjusted wages have fallen for four consecutive fiscal years, with a 0.5% decline in real wages in fiscal 2025 alone. Citizens are poorer, while the government is bigger, even as headline macro indicators show stability.

The most visible symptom of this model’s exhaustion is the yen. Despite repeated interventions by the Bank of Japan and a shift towards higher policy rates—the BOJ’s benchmark is now at its highest point since the mid‑1990s—the currency has slid to levels not seen in almost forty years. Each attempt to defend the yen produces a brief rebound, but the broader trend reflects markets’ concern about Japan’s long‑term fiscal and monetary sustainability.

Japan is not going bankrupt in strict terms; it is demolishing its currency, which is equivalent to an implicit default.

No one wants Japan to fail, but the model has delivered nothing in the past decade. The IMF talks about solid output growth, robust domestic demand, and low unemployment. However, domestic demand and GDP are disguised by constantly rising government spending, while low unemployment is a consequence of challenging demographic conditions. Japan’s population is aging and shrinking, and Keynesianism has made it harder for families to grow and have children.

If GDP and domestic demand were really strong, the country would have a strong currency. Instead, the yen weakness reveals investors’ skepticism regarding a model that combines very high debt, structurally positive inflation, and decades of real wage stagnation.

Japan has avoided a formal sovereign default and sudden stop in financing not because the Keynesian model is sound, but because the country still attracts a “gigantic” inflow of foreign capital and investment. Those inflows supply dollars, support asset prices, and help keep the system running despite its internal contradictions. A Bank Of Japan obsessed with raising asset prices by increasing ownership of ETFs shows it is more interested in headline figures than citizens’ cost of living.

On the surface, the wage picture in early 2026 looks encouraging. Average cash earnings grew 3.5% year‑on‑year in April 2026, marking the 52nd consecutive month of nominal wage gains and the fastest pace since late 2024. Base pay was up 3.4%, and nominal wages rose across sectors—from manufacturing and construction to information and communications and finance. Government data show that in March, nominal wages increased about 2.7%, while the consumer inflation rate used to calculate real wages stood at 1.6%, allowing real wages to rise roughly 1% in that month. However, these monthly improvements sit atop a longer‑term pattern where inflation has outpaced wage growth. Over fiscal 2025, real wages fell 0.5% and the small bounce may be short-lived as estimates show another negative real wage year for 2026. Japan’s real wages have stagnated for nearly 30 years since peaking in 1997. The inflation that policymakers wanted to generate is ultimately eroding the living standards of the citizens whose demand is supposed to sustain growth.

Against this backdrop, calls to raise taxes further to stabilize the public accounts risk pushing the system into another vicious circle. Higher taxation would likely weaken investment and capital inflows, undermine competitiveness, and intensify pressure on households. Immigration, often proposed as a demographic fix, may raise aggregate GDP but also increase fiscal strain when public finances are already deeply imbalanced, as seen in other advanced economies.

Japan’s situation is not a sudden accident; it is the culmination of policies that have been failing for decades. The country’s wealth, export capacity, and capital inflows allowed it to live with large imbalances for a long time. The difference today is that the traditional strengths have weakened, and the latest data make the structural problems clearer.

Japan shows the structural failure of a policy approach that “always seeks to expand public imbalances at the expense of citizens.” The Keynesian experiment in Japan aimed to prove that government is a key engine of growth but instead produced long‑term stagnation, high debt, and an erosion of real incomes. The yen’s weakness is simply the symptom of a larger disease: statism. And some want to repeat it in your country.