Trade policy openness — tariffs, non-tariff barriers, FTAs, industrial protection.
Targeted industrial and sectoral subsidies (renewable energy, chip manufacturing, agriculture, green hydrogen, etc).
Section 232 tariffs on steel (25%) and aluminum (10%) imports, and Section 301 tariffs on ~$370bn of Chinese imports in four tranches (2018-2019). Retaliation by China, EU, Canada, Mexico followed. Most Section 301 tariffs retained under Biden. Empirical literature (Amiti-Redding-Weinstein 2019, Fajgelbaum et al 2020) finds near- full pass-through to US prices, negligible-to-negative employment effects in protected sectors, and net welfare loss to US economy. Canonical case of coalition-content mismatch: Republican- implemented state intervention in trade (refinement D.3.1).
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.