Statutory and effective corporate tax rates, treatment of depreciation, and international competitiveness.
General government spending as share of GDP, excluding transfers already captured under fiscal.transfer_expansion to avoid double-counting.
Rule of law as institutional substrate — contract enforcement, judicial independence, equal treatment before the law. Upstream of most other axes.
Comprehensive tax-law overhaul enacted Dec 1983: new Income Tax Law (UU 7/1983), VAT Law (UU 8/1983) with 10% rate effective 1 Apr 1985, General Provisions on Taxation (UU 6/1983), Land and Building Tax (UU 12/1985). Replaced colonial-era and 1950s ordinances with a modern self-assessment regime. Harvard Institute for International Development advisory support (Malcolm Gillis). Tax/GDP ratio (non-oil) rose from ~5% (1983) to ~11% (1990).
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.