The Federal Funds Rate

Short-term borrowing costs across the financial system are priced against it. Bank funding, corporate credit lines, floating-rate loans and money market yields all move with it, and longer-dated rates reflect where it is expected to go.

The Fed does not dictate the rate. It sets a target range and uses administered rates to keep the effective rate inside it, and the market clears within that band. The distinction matters in stress, when the effective rate can move within or even outside the range.

1. 1Borrowing costs changeImmediately for floating-rate debt, gradually as fixed-rate debt matures and is refinanced.
2. 2Spending respondsRate-sensitive activity such as housing and capital investment slows or accelerates.
3. 3Employment followsHiring adjusts to demand, over several quarters.
4. 4Prices adjust lastInflation responds most slowly of all.

The lag also explains a pattern that otherwise looks like incompetence. Central banks routinely keep tightening into a slowdown, because the slowdown they are causing has not appeared in the data they are reacting to.

• Discounting: a higher risk-free rate reduces the present value of distant cash flows, and hits long-duration growth companies hardest.
• The alternative: when cash yields materially more, the bar for holding equities rises.
• Interest costs: leveraged companies pay more as debt reprices.
• Demand: rate-sensitive sectors see actual business volumes change.

The first is the one that produces the sharpest single-day reactions. A company whose value sits mostly in cash flows a decade away is arithmetically more sensitive to the discount rate than one earning it today, which is why growth and value diverge so cleanly around rate moves.

The rate that matters economically is the real rate: the nominal policy rate less expected inflation. A five percent policy rate with six percent inflation is stimulative; a two percent rate with zero inflation is restrictive.

This is why headlines about the level of rates in isolation are close to uninformative. The same nominal rate is loose or tight depending entirely on what inflation is doing alongside it.

The FOMCFOMCThe committee that sets the federal funds target range, meeting eight times a year.Read the full explanation sets a target range rather than a rate, and it does not order anyone to trade there. The range is enforced by making it unattractive to transact outside it, using two administered rates that act as a floor and a ceiling.

The practical consequence is that the effective federal funds rate, the volume-weighted average of what was actually transacted, sits inside the range rather than at a point. When it drifts toward an edge, it is a signal about funding conditions rather than about policy, and it is watched for exactly that reason.

An equity is a claim on cash flows extending decades into the future, and the overnight rate applies to money lent for one night. The connection between them runs through discounting, and it is arithmetic rather than sentiment.

A future cash flow is worth less today than it will be worth then, and how much less depends on the rate used to discount it. That rate is built from a risk-free base plus a premium, and the risk-free base is anchored by policy at the short end and by expectations of policy further out. Raise the expected path and every future cash flow is discounted harder, with the effect compounding over the number of years involved.

There is a second channel that operates on the cash flows rather than on the discount rate. Higher rates raise the cost of borrowing for companies and for their customers, which reduces the profits being discounted. The two channels usually point the same way, which is why the effect looks larger than either alone.