Auto-loan monthly-payment targeting identifies a financing choice after the object is already wanted. The kitchen-table gestalt "will this break the next year" is not shown to be the fertility analogue of that scalar. Tempo evidence cannot identify the quantum case the production function is written to explain.

The Finnish load-bearing finding localizes union-to-first-birth failure to a four-input residual. That does not answer §III's diagnostic — which input is binding — so the specimen that is supposed to show the production function at work does not apply it.

The boxed invariant scores a household-ledger delta the decision-maker "sees." Commitment horizon and cultural permission are not ledger lines. A ministry scoring the box will pass cash-adjacent instruments and fail the inputs §V leaves as the residual — the page's own Type-3 risk installed as the test.

Auto-enrollment is a default on a wanted, reversible, low-identity action. Fertility is irreversible. The page fills structural empathy with constraint changes (housing, school timing, employer norms) that do not perform the commitment-horizon function, and forbids lock-in, so the analogue does not name an actuator.

Booking demographic-capital depreciation is a public-ledger instrument. The thesis is that the household does not decide on that ledger. Under the page's own invariant the last repair fails unless it also changes the blocked household input, and the owner, threshold, and refusal seats are empty.

Two ledgers, opportunity cost, tempo/quantum, welfare crowding-out, second demographic transition, and gender-equity residuals after hardware are already how fertility is argued. The remainder that would change novelty is a refusal rule that can close a package as targeting the wrong input, not another production-function list.

Joint-taxation neutrality and family-unit pension accrual can raise the second earner's marginal rate, tightening that person's present-margin and career slack while trying to extend commitment horizon. The invariant's "decision-maker" is singular; the Finnish conversion failure is inside unions where the veto may sit with the partner whose slack fell.