Immigration policy openness — work visas, family reunification, asylum processing, border enforcement posture.
Trade policy openness — tariffs, non-tariff barriers, FTAs, industrial protection.
Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
The Council decided in December 2024 to remove checks on persons at the internal land borders with and between Bulgaria and Romania from 1 January 2025, completing the staged Schengen accession that had already lifted air and maritime internal border controls in March 2024. The policy reduced remaining internal mobility frictions while keeping Schengen external-border obligations applicable.
Per invariant 3, reforms are scored by what they did on each channel-separated axis, not by the party that enacted them. This fingerprint is how the policy-match engine finds historical analogues.
Explicit links are curated by the author. Inferred links are hypotheses in the library that test the same axes this policy moved — the framework's answer to "what does the data say about a policy like this?".
Ranked by axis-fingerprint overlap with this policy. Direction match bolded — those are the closest historical analogues. Shape of the match is what drives policy-outcome comparison, not the country or party label.