Progressivity of the personal income tax schedule, including top marginal rates, bracket spread, and targeted credits (EITC-equivalents).
The Law of 15 July 1914 created the general income tax that reformers around Joseph Caillaux had pursued for years. The new instrument added a progressive tax on total household income above the existing schedular taxes and gave the French state a more modern direct-revenue base just before the First World War. Although wartime finance soon transformed the fiscal context, the 1914 statute was the decisive break with a system dominated by older indirect and proportional levies and became a durable anchor of tax progressivity in French public finance.
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.