Central banks: the people who set the price of money

Every six weeks or so, about 25 people meet in a building in Frankfurt. They discuss numbers, argue for a few hours, and then announce a decision that moves the price of money across twenty countries. The rate on Giorgio’s mortgage, the yield on Sofia’s bank account, the cost of Luca’s future student loan — all of them shift within days of that meeting.

That meeting is the European Central Bank Governing Council, and this lesson is about what they do, why they do it, and how it reaches you.

The ECB in one paragraph

The ECB (European Central Bank) is the central bank of the eurozone — the 20 EU countries that use the euro as currency, including Italy. Its official mandate, written into the EU treaties: maintain price stability in the eurozone, defined since 2021 as a symmetric 2% HICP inflation target over the medium term (source: ECB, Monetary policy strategy review, 2021).

Secondarily, “without prejudice to the primary objective,” the ECB supports general EU economic policies — meaning growth and employment when inflation is under control.

Price stability first, everything else second. That priority order shapes every rate decision.

Who decides what

Two main bodies:

Governing Council — sets monetary policy. Consists of the six ECB Executive Board members + governors of the 20 national central banks of the eurozone countries (including Banca d’Italia’s governor). Meets every six weeks; rate decisions announced on Thursday afternoons in Frankfurt.
Executive Board — day-to-day management. Six members, including the ECB President (Christine Lagarde as of 2025).

Banca d’Italia (BdI), Italy’s central bank, implements ECB policy in Italy. It doesn’t set eurozone interest rates anymore — that power moved to Frankfurt in 1999 when Italy joined the euro. BdI still has important jobs: banking supervision in Italy, statistics collection, financial stability, and historically publishing some of the best economic research in the country.

The three rates that matter

The ECB sets three policy rates; they’re announced together. As of late 2024:

Deposit facility rate (~3.00%) — what banks earn on overnight deposits they park at the ECB. This is the one everyone watches lately because it’s the binding constraint in the current balance-sheet environment.
Main refinancing operations rate (~3.15%) — the rate at which banks can borrow from the ECB for one week against collateral.
Marginal lending facility rate (~3.40%) — overnight emergency borrowing, at a penalty rate.

The deposit rate is the floor, the marginal lending the ceiling. Market rates live between.

These ECB policy rates directly anchor Euribor — the interbank rate European banks charge each other — which is what your variable-rate mutuo is usually indexed to. When the ECB moves, Euribor moves, and within weeks your mutuo payment moves.

Transmission: how it reaches you

Here’s the chain from Frankfurt to Giorgio’s bank account:

  ECB deposit rate changes
           ↓
  Banks' funding costs change
           ↓
  Banks change rates they pay on deposits
  Banks change rates they charge on loans
           ↓
  Euribor moves (interbank rate)
           ↓
  Your mutuo rate (if variable) moves
  Your conto deposito interest moves
  New bond issues price at different yields
           ↓
  Consumption and investment decisions change
  (cheaper borrowing → more buying; more expensive → less)
           ↓
  Inflation and growth respond (slowly, 12-24 months)

The whole chain takes about a year to fully work through. When the ECB raised rates from 0% to 4% in 2022-2023, it did so to cool inflation. Inflation only started visibly falling 12-18 months later. This lag is why central banks can never do precise targeting — they’re always adjusting based on forecasts, not current data.

What QE (quantitative easing) actually is

Quantitative Easing is the thing central banks do when the regular interest-rate lever is maxed out (at or near zero) and they still want to stimulate the economy.

Mechanically: the ECB creates new money and uses it to buy government bonds (and sometimes corporate bonds) from banks. This has two effects:

Money supply up. Banks now have fresh reserves, more money in the system.
Bond prices up, bond yields down. Buying any asset at large scale pushes its price up. Bond prices and bond yields move inversely, so yields fall. Cheaper borrowing for governments and corporations. Cheaper mortgages.

The ECB ran a massive QE program from 2015 to 2018 and again 2020-2022. By 2022 the ECB balance sheet was about €9 trillion — roughly 70% of eurozone GDP. The Federal Reserve did a similar thing. These are operations so large they’re hard to intuit — “the ECB bought bonds equivalent to 70% of the entire EU economy.”

Consequences for ordinary people:

Borrowing rates fell to record lows. 10-year BTP yields touched 0% in 2020. Some eurozone governments briefly borrowed at negative rates.
Mortgage rates fell. Giorgio, who refinanced in 2021, got a 20-year fixed at 1.3%. That rate would be unthinkable in 2024’s environment.
Savers were punished. Conto deposito rates fell to 0.1-0.2%. Money sitting in the bank lost value to inflation every year.
Stock and house prices rose. When safe returns are near zero, risky assets become more attractive by comparison, and prices adjust upward.

Then inflation came. In 2022, eurozone HICP inflation hit 10.6% — the highest since the euro was introduced (source: Eurostat HICP, December 2022 release). The ECB had to reverse course hard, hiking rates faster than at any time in its history and starting Quantitative Tightening (QT) — letting the bonds it holds mature without replacing them, shrinking its balance sheet.

The lesson: QE and QT are not free. They move a lot of economic dials, sometimes with side effects that take years to appear.

Why interest rates matter for personal finance

Four direct, personal consequences:

1. Your mortgage rate

Italian mortgage rates track ECB policy closely. In October 2021, a 20-year fixed Italian mutuo was around 1.3% (source: Banca d’Italia, Rilevazione sui tassi di interesse attivi e passivi). In late 2023 it was around 4.5%. Same customer, same apartment, same bank — rate tripled because of where the ECB went.

Translation for Giorgio: buying the same €250,000 apartment with a 20-year 80% mutuo cost him about €1,070/month at the 2021 rate and would cost €1,510/month at the 2023 rate. Over 20 years that’s €105,600 extra paid in interest.

2. Your savings yield

When ECB rates are high, banks pay more on conto deposito (just not as much more as they charge on loans — that’s the spread banks live on).

2020 average: ~0.1% gross on a 12-month conto deposito. 2024 average: ~3.5% gross on a 12-month conto deposito.

Same €10,000 Sofia might park. 2020 interest after the 26% capital-gains tax that applies to deposits: €7.40. 2024: €259. Meaningful.

3. Italian government bonds (BTP, BOT)

Same logic. BTP Italia issued in 2020 yielded ~1.4%. BTP Italia 2024 issued at around 4-4.5%. For a retiree relying on bond income, the difference is significant. Lesson 21 goes deep on BTP.

4. Stock prices (indirectly)

When interest rates are low, the “discount rate” used to value future cash flows is low, making stocks relatively more valuable. When rates rise, future cash flows are discounted more, and stock prices (especially growth stocks) tend to fall. This is why 2022 was a bad year for stocks despite corporate earnings being fine — it was almost entirely rate-driven.

Not something to trade on, just to understand.

The limits of monetary policy

Central banks have real power but also real limits.

What they can do well:

Cool a clearly overheating economy (inflation above target, unemployment low).
Provide liquidity during financial panics (2008, 2011, 2020 all proved this).
Anchor inflation expectations if they’re credible.

What they can’t do:

Create productive capacity. If the economy physically can’t produce more, cheaper money just pushes up prices.
Fix supply-side inflation with demand tools. The 2022 inflation was partly caused by Ukraine/energy/supply chains — the ECB’s rate hikes couldn’t undo those, only dampen the secondary demand effects.
Fix structural unemployment. If Italy’s labor market has frictions (lesson 17 onwards), no interest rate solves that.
Solve political problems. The eurozone debt crisis of 2011-2012 was mostly a sovereign-solvency concern; the ECB provided emergency support but couldn’t by itself fix the underlying fiscal issues.

Watching ECB meetings, for normal people

Should you watch Christine Lagarde’s press conferences? No, unless finance is your hobby. What you should do:

Know your rates. Variable-rate mutuo holders should check Euribor monthly. Conto-deposito savers should compare bank rates annually.
Don’t trade on rate news. By the time you hear “ECB will raise rates next meeting,” it’s already priced in.
Know where we are in the cycle. When rates are low, borrowing is attractive and saving less so; when high, reverse. Lesson 32 on market history will put this in perspective.

For the truly curious: the ECB publishes its Account of Monetary Policy Meeting four weeks after each decision (https://www.ecb.europa.eu/press/accounts/html/index.en.html). They’re a surprisingly readable summary of what the Governing Council discussed.

What to do with this lesson

Three things:

Check your mutuo’s indexation. If variable-rate, find out which Euribor tenor (1M/3M/6M) it tracks and the spread above it. That tells you how your monthly payment will move.
Compare conto deposito rates annually. When ECB rates are high, shop around. The difference between 2% and 3.5% on €10,000 is €150/year for the same risk.
Understand “price of money” vs “price of goods”. Central banks control the first directly; the second indirectly and imperfectly. Keep those two separate in your head.

Sources

ECB — Monetary policy strategy. https://www.ecb.europa.eu/mopo/strategy/html/index.en.html (retrieved 2025-02).
ECB — Key interest rates. https://www.ecb.europa.eu/stats/policy_and_exchange_rates/key_ecb_interest_rates/html/index.en.html (retrieved 2025-02).
Banca d’Italia — Tassi d’interesse. https://www.bancaditalia.it/statistiche/tematiche/moneta-intermediari-finanza/tassi-interesse/index.html (retrieved 2025-02).
Eurostat — HICP annual rate. https://ec.europa.eu/eurostat/web/hicp/database (retrieved 2025-02).

Next lesson: inflation, in full detail. (This is a rewrite of the existing “Inflation explained” post — it gets the full course-voice treatment and cites all the ISTAT methodology.)