An interest rate is a price#
Strip the mystique: borrow $100, repay $105, and the $5 is the price you paid for having the money early. That’s all a rate is. Banks, companies and governments all pay a version of it, and the Federal Reserve sets the one at the bottom of the stack — the rate banks charge each other for overnight loans.
Everything else references it. Mortgages, corporate bonds, car finance, the yield on your savings account. Move the base and the whole structure shifts.
Two channels into the stock market#
Rates reach equities two ways, and they push in the same direction.
Through companies. Cheap borrowing means firms build, hire, and launch things, which raises profits and share prices. Expensive borrowing means projects get shelved and growth slows.
Through the alternatives. When safe assets pay well, some investors take the safe return and leave. When cash and bonds pay almost nothing, that money goes looking for returns in stocks. Rates set the height of the bar equities have to clear.
Hence the reflex: cuts generally lift stocks, hikes generally pressure them. As of the July 2026 meeting the target range sits at 3.50–3.75%, with the next decision due in September.
I’d add the caveat that gets lost in the reflex. Markets price expectations, not announcements. By the time a cut is delivered, it’s usually been anticipated for months and is already in the price — which is why stocks sometimes fall on a cut. The move that matters is the gap between what was expected and what happened, plus whatever the accompanying language implies about next time. Trading the headline rather than the surprise is a reliable way to be late.
Four tools, in descending order of use#
The federal funds rate is the headline instrument. The Fed sets a target range and steers the actual rate into it.
Open market operations are how that steering happens. Buying government bonds puts cash into banks, giving them more to lend, pushing rates down. Selling drains cash and pushes rates up.
The discount rate is what the Fed charges banks borrowing directly from it at the discount window. Normally set above the funds rate, because banks are meant to prefer borrowing from each other — it’s a backstop, not a first resort.
Reserve requirements — the share of deposits banks must hold rather than lend. Largely historical now: since 2020 most banks face a 0% requirement, so this lever is described in textbooks more than it’s used.
What a crisis actually looks like#
2008 is the worked example of the toolkit at full extension.
Banks took catastrophic losses, Lehman Brothers failed, credit froze, and the risk was a general collapse. The response ran through all three usable tools at once:
- The funds rate went from around 5% to nearly zero.
- Quantitative easing — buying enormous quantities of government bonds and mortgage-backed securities. This is the part worth understanding: the point wasn’t the overnight rate, which was already at the floor. It was to push down long-term rates, the ones attached to mortgages and business loans, by buying those assets directly.
- Direct lending to banks, with a lower discount rate and active encouragement to use the window, so institutions short of cash didn’t fail for want of a few days’ funding.
Recovery took years. But the sequence is the template, and versions of it have been redeployed in every subsequent scare.
Two honest qualifications. The tools rescue the financial system, which is not the same as rescuing the economy people live in — asset holders recovered considerably faster than wage earners after 2008, and that gap is part of why the decade that followed felt the way it did. And the emergency toolkit works partly because it’s rare; a decade of near-zero rates has consequences of its own in asset prices and in what happens when inflation returns.
So what to actually do#
- Watch the target range and the language, not just the decision. The surprise is what moves prices.
- Stop trading the announcement. If you knew it was coming, so did everyone.
- Understand which rate affects you. Mortgages track long rates; savings and credit cards track short ones.
- Expect the crisis playbook, and expect it to arrive alongside consequences that show up years later.
- If you hold index funds, use this to understand your returns, not to time them. Knowing why the market did something is worth a great deal. Believing that lets you predict the next thing is worth less than nothing.
Sources & further reading#
- FOMC statement, June 2026 — Federal Reserve — the current 3.50–3.75% target range and accompanying guidance.
- Federal Funds Target Range, Upper Limit — FRED, St. Louis Fed — the full history of the target range, including the near-zero period after 2008.
- The Fed Explained — Federal Reserve — the official description of the policy tools and how the target rate is implemented.
