Master Framework • Central Bank Plumbing & Transmission
Master Framework #1: The Central Bank & Interbank Plumbing Transmission Engine
The definitive institutional blueprint tracing monetary policy from the FOMC target rate through IORB, repo markets, primary dealers, commercial lending, and capital assets.
Author: CMD Wire Institutional Research
Updated: August 2026 • 9 min read
Executive Blueprint: The 5-Tier Transmission Mechanism
Monetary policy does not impact corporate balance sheets or equity valuations in a vacuum. It propagates through a precise, multi-tiered institutional plumbing cascade across five consecutive financial layers:
The End-to-End Monetary Policy Pipeline
- Tier 1 (Administered Rates): FOMC sets the Target Range $\to$ calibrated via IORB (Ceiling/Floor) and ON RRP (Sub-Floor).
- Tier 2 (Overnight Money Markets): Interbank cash clears at SOFR, EFFR, and Tri-Party Repo. Arbitrage keeps wholesale rates tightly inside the corridor.
- Tier 3 (Primary Dealer Balance Sheets): Primary dealers adjust inventory and repo financing haircuts, repricing Treasury Yield Curves and commercial paper spreads.
- Tier 4 (Commercial Banking & Credit Supply): Depository institutions recalibrate underwriting standards via SLOOS standards, adjusting prime lending rates and corporate credit availability.
- Tier 5 (Real Economy & Asset Multiples): Discount rates shift equity duration multiples, corporate hiring freezes take effect, and the Sahm Rule trigger signals cycle inflection.
Institutional Summary & Cross-Asset Linkages
Understanding this five-tier transmission engine enables institutional portfolio managers to identify where monetary policy friction is accumulating before it manifests as equity multiple compression or credit spread widening.