Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Trade policy openness — tariffs, non-tariff barriers, FTAs, industrial protection.
Landmark tax-harmonisation reform under PM Narendra Modi. Replaced ~17 central + state indirect taxes (VAT, central excise, service tax, entry tax, octroi, etc.) with a unified Goods and Services Tax with 4 main rates (5/12/18/28%). Destination-based tax with input tax credit chain. Required constitutional amendment + multi- year negotiation with states via GST Council. Short-run disruption (2017-2018 Q2 GDP slowdown) as supply chains adapted, followed by gradual compliance-base expansion and some formalisation of informal sector. Foundational institutional-quality improvement in Indian tax architecture.
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.