You’ve probably heard it in the news: “the Fed raised rates” or “the Fed cut rates.” But what rate, exactly, and why does one number set by a handful of officials in Washington move stock prices, mortgage costs, and currency markets around the world? Here’s the plain-English breakdown.
What Exactly Is the Federal Funds Rate?
The federal funds rate is the interest rate U.S. banks charge each other for overnight loans of reserves. Banks are required to hold a certain amount of cash in reserve each night, and when one bank has a surplus while another is short, they lend to each other overnight to balance their books. The rate on those loans is the federal funds rate.
The Federal Reserve doesn’t dictate a single fixed number. Instead, it sets a target range (for example, 4.25%–4.50%) and uses its policy tools to keep the actual market rate inside that band. Because this rate ripples through savings accounts, credit cards, mortgages, auto loans, and corporate bonds, it functions as the base rate for the entire U.S. financial system — which is why it’s often just called “the Fed’s interest rate.”
Who Sets It, and How?
No single person, not even the Fed chair, sets this rate alone. It’s decided by the Federal Open Market Committee (FOMC) — the Fed’s rate-setting body, made up of the Board of Governors and regional Federal Reserve Bank presidents. The FOMC meets eight times a year, reviewing the latest inflation, employment, and growth data before voting to raise, lower, or hold the rate steady.
That’s also why a single speech — like the Fed chair’s annual address at the Jackson Hole Economic Symposium — can move markets so much. Investors treat it as a preview of what the FOMC is likely to decide next.
Why Raising or Cutting Rates Matters
The federal funds rate is the Fed’s primary lever for managing inflation and economic growth.
- Raising rates: Borrowing gets more expensive — mortgages, credit cards, and business loans all cost more. That discourages spending and investment, which in turn cools inflation. This is the tool the Fed reaches for when prices are rising faster than it wants.
- Cutting rates: Borrowing gets cheaper, encouraging spending and investment and giving the economy a boost. The tradeoff is that easier money can reignite inflation down the road.
The basic logic: raise rates to fight inflation, cut rates to support growth.
Why the Whole World Watches This One Number
Most countries have their own version of a policy rate, set by their own central bank. But because the U.S. dollar is the world’s reserve currency, moves in the federal funds rate carry outsized weight. When U.S. rates rise, global capital tends to flow toward dollar assets, which now offer both safety and a better yield. That shift can affect currency values, emerging-market stocks, and even other central banks’ own rate decisions. It’s part of why investors everywhere — not just in the U.S. — pay close attention to what the Fed says and does.
Key Terms Worth Knowing
- FOMC: The Federal Open Market Committee, the body that sets the federal funds rate. Meets eight times a year.
- Hawk / Dove: “Hawkish” describes a preference for higher rates and tighter policy to fight inflation; “dovish” describes a preference for lower rates and looser policy to support growth.
- PCE Price Index: The Fed’s preferred inflation gauge for judging progress toward its 2% target. Similar to the Consumer Price Index (CPI), but calculated differently.
- Basis point (bp): A unit for measuring rate changes. 1 bp = 0.01 percentage points, so a “12 bp increase” means a 0.12 percentage-point move.
- Forward guidance: The Fed’s practice of signaling its likely future rate path to the market in advance.
With those basics in hand, the next article looks at how this all played out in practice: what actually happened at the 2026 Jackson Hole Economic Symposium.