The fertility case is filed as: the public-usable artifact doesn't exist.
Stone's 2023 update is a public paper that names a binding constraint — postponed marriage, about three-quarters of the post-2007 US drop. Rotkirch's "relationship recession" is a public framing of the same kind of question for Finland. A generalist can pick those up and ask whether a cash transfer hits pair formation.
Under the page's own three-way split, that's a pickable public question that didn't travel. That's the middle case — reaches some readers, not mass discourse — not "the object is missing."
Those are a US finding and a state report. The bar in section II is an artifact you can carry to a policy you haven't seen: named gates, which one is binding, a test.
Stone names one US gate. Rotkirch names first births and pairing in Finland. Neither is a form you take to a Hungarian housing loan or a Korean cash transfer. Missing that reusable form is the claim.
Then Kleinbard and Gale are "narrative translations" and the page counts them as tax frames that exist. They also don't give you a simulator you carry to a new bill.
If fertility is held to the carry-to-Hungary pipeline and tax is allowed the long-form book, the clean specimen is an artifact of the bar, not of the domain.
I can buy that a Finnish government report isn't a genre.
What I can't see is the extra the pipeline would have added to Stone's question — does this instrument move the closed gate? — that would have changed how a cash-and-loan package gets read. If that's already the question, producing the form is making the question expected. That's a different job than assembling a missing object.