What does a central bank actually do?

You've now met the policy rate and the inflation it's meant to tame. Time to meet the institution holding the thermostat.

The job description

A central bank is a country's (or currency zone's) monetary authority. Its defining assignment is the mandate:

• The US Federal Reserve carries a famous dual mandate: stable prices AND maximum employment — two goals that regularly pull in opposite directions.
• The European Central Bank puts price stability first, with support for the broader economy as a secondary aim.
• Most others (Bank of England, Bank of Japan, and dozens more) run variations on the same theme, usually anchored to that ~2% inflation target from the previous unit.

Beyond the mandate, central banks issue the currency, sit as lender of last resort when banking panics strike, and watch over financial stability — the fire-department half of the job that only makes headlines during fires.

Why they're deliberately unelected

Central bankers are appointed, not elected — by design. Fighting inflation sometimes requires raising rates into a slowing economy: medicine no politician facing re-election wants to administer. History's verdict is fairly consistent — countries whose central banks bend to political pressure tend to end up with the printing press running and inflation entrenched. Independence is the institutional wall between the money and the election cycle, and markets watch threats to that wall as seriously as they watch the rates themselves.

Why markets hang on their words

Put the course together: rates are gravity (Unit 1), inflation is the enemy (Unit 2), and this institution sets the gravity to fight the enemy. That makes the central bank the single most market-moving institution on Earth — and its communication a genre of its own, which the rest of this unit teaches you to read.

The one number all of that resolves to is the policy rate, and every one of these banks publishes theirs, dated, every day — with a wrinkle worth meeting early: some banks publish more than one rate for the same date, because their "policy rate" is a corridor or a band rather than a point.

Try it now

1. Name your economy's central bank, its head, and its mandate (one minute of searching).
2. Below are the policy rates of two banks, the Fed and the ECB, for their latest date. Count how many rates each bank publishes for a single date, and note the date beside the rate: a policy rate quoted without its date is a rate from some meeting, and you do not know which.

3. One sentence: why does rate-setting sit with appointees rather than parliaments?
4. Explain "lender of last resort" to an imaginary friend in under thirty seconds.