Not investment advice. Educational reading. See Disclaimer.
L.10 · BEGINNER · 2 MIN
How the Federal Reserve Actually Works
If you own stocks, bonds, real estate, or even a savings account, the Federal Reserve sets the gravity your portfolio operates under. Eight FOMC meetings a year, two administered rates, and a public balance sheet — those three levers reach every asset price on earth. This lesson unpacks how the modern Fed actually transmits policy, so the next time the chair speaks you can read past the headlines.
The Fed has two legal jobs (the dual mandate): maximum employment AND stable prices, defined as 2 percent inflation measured by core PCE. The two goals can pull in opposite directions — high inflation with low unemployment is the textbook tightening setup; rising unemployment with on-target inflation is the textbook easing setup.
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Tool
What it does
Why it matters to investors
IORB
Rate paid on reserves held at the Fed
Sets the FLOOR of short-rates by arbitrage
ON-RRP
Rate offered to money funds via overnight reverse repo
Catches non-banks that cannot earn IORB
Open Market Operations
Buying or selling Treasuries / agency MBS
Changes the SIZE of the Fed balance sheet (QE/QT)
Forward Guidance
Communicating the likely future rate path
Moves the 2-year and 5-year before any rate change
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Post-2020 reality: the Fed operates in an 'ample reserves' regime. There are trillions of dollars of reserves sloshing in the system, so the old textbook story — Fed adds reserves, banks lend more, short rates fall — no longer describes how policy gets transmitted. Today rates move because IORB and ON-RRP move, not because the quantity of reserves changes day-to-day.
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The transmission chain runs: FOMC decision → administered rates (IORB, ON-RRP) → short Treasuries and money markets → longer Treasuries and mortgage rates → corporate borrowing costs and stock-valuation discount rates → real-economy decisions. Each link adds lag and noise. By the time a rate change shows up in unemployment, the Fed is usually two or three meetings past the decision that drove it.
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Visit the Markets view and read today's 3-month T-bill yield. Compare it to the current target fed funds rate (top of the range). The two should be within roughly 10-20 basis points. When they drift further apart, something has broken — either an upcoming Fed move is being priced in or year-end funding stress is distorting the bill market.
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The FOMC holds rates steady but the chair says future cuts are 'data-dependent and not pre-committed.' The 2-year Treasury yield rises by 15 bps in the next hour. What just happened?
Five questions · AI feedback
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Sit with the ideas.
The Fed lifts the IORB rate by 25 bps. Money market funds, repo desks, and bank Treasury teams all reprice within hours. Why does adjusting the rate paid on bank reserves move the entire short-end of the yield curve when the Fed never bought or sold a single bond?
