General government spending as share of GDP, excluding transfers already captured under fiscal.transfer_expansion to avoid double-counting.
Size of cash and near-cash transfer programmes (unemployment benefits, means-tested assistance, universal child benefits). Architecturally distinct from forced-saving schemes — see condition welfare_architecture.
Progressivity of the personal income tax schedule, including top marginal rates, bracket spread, and targeted credits (EITC-equivalents).
Taxation of capital income (dividends, capital gains, inheritance, wealth). Distinct from corporate rate.
The Greenhouse Gas Pollution Pricing Act (GGPPA), enacted in 2018, established a federal "backstop" carbon-pricing framework that imposes a fuel charge and an Output-Based Pricing System (OBPS) on emissions-intensive trade-exposed industries in any province whose own carbon-pricing regime falls below a federal benchmark. The fuel charge began at C$20/tCO2e in 2019 and rose to C$80/t by 2024 with a scheduled C$170/t by 2030; the SCC upheld the act's constitutionality in 2021 (References re GGPPA).
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.