Statutory and effective corporate tax rates, treatment of depreciation, and international competitiveness.
Trade policy openness — tariffs, non-tariff barriers, FTAs, industrial protection.
Targeted industrial and sectoral subsidies (renewable energy, chip manufacturing, agriculture, green hydrogen, etc).
Zambia changed the mineral royalty tax regime so that mineral royalties became deductible for corporate income tax purposes, reversing a non-deductibility rule that had raised effective tax rates for copper producers. The reform was part of the Hichilema government's mining-investment reset, intended to attract capital, resolve disputes around major mines, and raise copper output through a lower effective fiscal burden.
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.