MFG Calcs Signals

Observed Effective-Rate Movements

Name: MFG Calcs Observed Effective-Rate Movement Ledger
Creator: MFG Calcs
License: https://creativecommons.org/licenses/by/4.0/

Statistical episodes where the manufacturing effective calculated-duty rate moved, with import-value and Calculated-Duties changes before and after.

What this Signal shows

See statistical effective-rate movements and the associated import-value and Calculated-Duties changes before and after.

Cadence: Refreshed automatically as USITC posts new customs data.
Derived from the MFG Calcs monthly effective-rate aggregate over USITC DataWeb. An association, not causation: import customs value moves for many reasons and can be price or quantity. Full ledger at /signals/tariff-action-ledger.
Free to download as All episodes (CSV), Full ledger (JSON), Methodology (JSON) under CC BY 4.0.

Last reviewed 2026-10-01.