The Federal Reserve controls one interest rate directly: the rate at which banks lend reserves to each other overnight. Everything else — mortgage rates, corporate borrowing costs, the discount investors apply to future company earnings — is transmitted, not set. Understanding that transmission chain is the difference between reacting to headlines and understanding why an eighth of a percentage point can move trillions of dollars of market value.
From one rate to the whole curve
The overnight rate anchors the shortest end of the yield curve. Longer maturities are priced by expectations: a two-year Treasury yield is approximately the market’s average expected overnight rate over two years, plus a small premium for uncertainty. This is why the policy decision itself is often the least important part of a Federal Reserve meeting. What moves markets is the change in the expected path, communicated through the statement, the projections and the press conference. The Fed publishes its calendar, statements and projection materials directly at the Federal Open Market Committee.
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When the expected path shifts, bond prices move mechanically in the opposite direction to yields, and the longer the maturity the larger the price move. A thirty-year bond can lose a fifth of its value on a sustained two-point rise in long yields. This duration arithmetic is why 2022 was simultaneously a bad year for equities and the worst year in modern history for supposedly safe government bonds.
Why equities care
A share is a claim on future cash flows, and those cash flows must be discounted back to the present at a rate that begins with the risk-free yield. Raise the risk-free rate and the present value of a dollar arriving in ten years falls more than the present value of a dollar arriving next year. That is the whole reason rate increases hit fast-growing companies harder than mature ones: a larger share of their value sits far in the future.
There is a second channel that works in the opposite direction. Rates rise because the economy is strong, and a strong economy raises the numerator — actual earnings — even as it raises the discount rate. Whether a rate increase is good or bad for stocks therefore depends on which effect dominates, which is why the same policy move can be greeted with a rally one year and a selloff the next.
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The credit channel
Higher policy rates raise the cost of refinancing, and the effect is concentrated in businesses that borrow at floating rates or face near-term maturities. Corporate credit spreads widen when investors expect more defaults, compounding the increase in the base rate. Data on business lending conditions and bank credit standards, published through the Federal Reserve Bank of St. Louis economic database, is a more reliable early indicator of stress than equity prices, which tend to reprice later and faster.
Households feel the same channel through mortgage and consumer credit costs, and because housing is the largest asset most families own, policy transmits into consumer spending with a lag measured in quarters rather than weeks.
What the Fed cannot do
Monetary policy operates on demand, not supply. It cannot manufacture semiconductors, drill wells or train nurses. When inflation originates in supply constraints, the only tool available is to suppress demand until it matches the constrained supply, which is a blunt instrument with distributional consequences the central bank does not choose. Analysts at the International Monetary Fund have documented how differently the same policy stance transmits across economies with different mortgage structures and labour institutions.
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For an individual investor the practical implications are modest but real: match the duration of bond holdings to the horizon on which the money is needed, expect rate sensitivity to be concentrated in long-duration equities, and treat any confident forecast of the policy path — including the central bank’s own — as a probability distribution rather than a plan.
What is already priced, and what is not
The most common analytical error is reacting to the decision rather than to the surprise. Rate changes that markets have fully anticipated are already reflected in prices before the announcement, which is why a widely expected cut can be followed by falling asset prices and an unexpected hold by rising ones. What moves portfolios is the difference between the decision plus accompanying language and what participants had assumed, and that difference is usually communicated in the projections and the press conference rather than in the rate itself.
Statements, minutes and the projection materials are published directly by the Federal Reserve, and reading the change in language between consecutive statements is more informative than reading either one alone. The transmission into portfolios then runs through duration, which reprices immediately, through credit spreads, which reprice on the growth implication rather than the rate, and through equity valuations, where the effect is concentrated in long-duration growth assets whose value depends most heavily on distant cash flows. The mechanical result is that identical policy news moves different parts of a portfolio in different directions.
