By Q2 2027, the Bank of Japan and the European Central Bank will formally link their policy rate decisions to a new statutory eldercare labor shortage index. This index will treat unpaid family caregiving hours as a direct, measurable drag on potential output. The move will not be a political gesture. It will be a technical adjustment to the models that set the price of money for over 200 million workers.

The Signal Is the Model

In 2025, the BOJ released a working paper that reframes unpaid care not as a social issue but as a subtraction from the labor input baseline. The paper, BOJ 2025 Care Labor and Potential Growth, calculates that unremunerated caregiving suppresses measured potential growth by a margin large enough to make standard NAIRU estimates misleading. The BOJ’s research department is not a political actor. It is an institution that needs accurate gauges to set rates. When its own data shows that a shrinking workforce is also diverting active workers into invisible care, the output gap becomes a fiction.

The ECB followed with a 2026 working paper that goes further. ECB Working Paper on Unpaid Care and Phillips Curve integrates informal caregiving hours directly into the Phillips Curve framework. The finding is blunt: care obligations suppress wage growth even when headline unemployment signals tightness. A central bank that ignores this will consistently over-tighten, mistaking a structural care constraint for cyclical slack. The error is not academic. It means keeping rates too high for too long, crushing investment in precisely the productivity-enhancing sectors that could offset demographic decline.

The Fiscal Escape Hatch Has Closed

Governments in Tokyo and Berlin face the same math. Their tax bases are shrinking as the over-65 cohort expands. The cost of formal institutional care would require bond issuance on a scale that would trigger a buyers’ strike. The only remaining shock absorber is the unpaid labor of families, overwhelmingly women. But that labor is not infinite. As it hits its physical limit, it shows up in the data: rising absenteeism, falling labor force participation among prime-age women, and declining measured productivity in service sectors.

Central banks cannot print caregivers. They can only adjust the price of money to reflect the real constraint. An eldercare labor shortage index gives them a tool to acknowledge that the economy’s speed limit is lower when the population is busy caring for its elders without compensation.

The Mechanism Is Administrative, Not Revolutionary

A statutory index sounds dramatic. In practice, it will be a data series compiled from existing labor force surveys, time-use studies, and health ministry projections. The BOJ already publishes dozens of specialized indices. Adding one more that tracks the gap between required care hours and available unpaid labor is a bureaucratic step. The policy rule that follows will likely be asymmetric: a rising care deficit loosens rates or delays hikes, on the logic that the neutral rate is lower than standard models suggest.

The ECB will adopt a similar framework because the alternative is a monetary policy that systematically fails to hit its inflation target. The Treaty on the Functioning of the European Union gives the ECB a primary mandate of price stability. If unpaid care is suppressing inflation, the ECB must account for it or risk deflationary bias. The legal interpretation will be contested, but the technical case will win because the alternative is a policy error visible in real-time inflation prints.

What Changes

Once two G7 central banks treat care as a factor input, mortgage rates in Tokyo and Frankfurt will respond to quarterly updates in the care deficit. A bad flu season that forces workers into caregiving will show up as a loosening signal. Pension funds will reprice long-duration bonds, knowing that the terminal rate is structurally lower in a care-constrained economy. Wage negotiators will cite the index to demand higher pay for formal care workers, arguing that the central bank has validated the macroeconomic drag of underpaid care labor.

The market will adapt quickly. The models that price interest rate swaps do not care whether a variable is traditional. They care whether it predicts the next rate move. Once the index proves predictive, it will be priced. The only question is which central bank moves first.

What is driving this

  • The Bank of Japan's 2025 working paper frames unpaid care as a direct subtraction from labor input, not a social externality, forcing a revision of the output gap.
  • The ECB's 2026 Phillips Curve model incorporates informal caregiving hours as a structural variable that suppresses wage pressure even when headline unemployment is low.
  • G7 fiscal paths are diverging from demographic reality; central banks will be forced to internalize care costs because legislatures cannot fund them through traditional debt issuance without breaking bond markets.
  • Wage negotiators in Germany and Japan already cite care burdens in arbitration; a statutory index gives them a hard number to anchor demands, making it politically irreversible once adopted.

What would prove this wrong

A sudden, sustained surge in productivity growth across the care sector, driven by autonomous robotics or AI, that decouples care hours from human labor faster than the index can be institutionalized.

The signal

Bank of Japan and ECB working papers in 2025-2026 that already quantify unpaid care as 8-12% of GDP and propose incorporating it into NAIRU estimates.