Progressivity of the personal income tax schedule, including top marginal rates, bracket spread, and targeted credits (EITC-equivalents).
General government spending as share of GDP, excluding transfers already captured under fiscal.transfer_expansion to avoid double-counting.
Counter-cyclical tax reform enacted March 2009 — PIT bracket changes raising tax-free threshold from EUR 10,000 to 11,000, lowering middle- bracket rates, expanded family-deduction (Kinderfreibetrag, Familien- beihilfe raise). Estimated volume EUR 3.2bn/year, ~1% of GDP.
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.