How Liquidity Flows Actually Move Markets - Advanced Topics
How Liquidity Actually Moves Markets
A Working Manual On The Plumbing — TGA, Reserves, RRP, SOFR, Settlements, And Why Bitcoin Has Historically Been One Of The Cleanest Gauges In The System
The relationships outlined in this piece were discussed in real time across a series of articles published beginning in the summer of 2025, as these dynamics were developing in markets.
Why This Matters
From October 2025 through February 2026, the S&P 500 declined on most Treasury settlement days but rose on most non-settlement days.
That pattern was not driven by earnings, headlines, or sentiment.
It aligned with liquidity.
Liquidity does not move randomly. It moves through a system — and in many cases, it follows a calendar.
Most market commentary focuses on outcomes: rate cuts, earnings, or geopolitics. Those are typically downstream.
The mechanism that has historically influenced whether risk assets can rise or sustain valuations is the daily interaction between:
The U.S. Treasury
The Federal Reserve
Primary dealers
Money-market funds
The overnight funding market
This framework is designed to help interpret those relationships using publicly available data.
By the end, you should be able to:
Identify Treasury settlement days that have historically aligned with tighter liquidity conditions
Monitor SOFR, IORB, and EFFR for signs of funding pressure
Understand how TGA and RRP flows translate into reserve balances
Recognize how liquidity conditions have tended to show up across asset classes
Place market movements within a broader liquidity context
This is not a predictive model or a recommendation. It is a structured way to interpret market plumbing.
Part 1 — The Plumbing: The Four Accounts That Matter
Before discussing flows, the system needs to be clearly defined.