Central banks control the price of money. They cannot directly set inflation, growth, or exchange rates, but they can move short rates and reserves until the economy responds. Master the tools, the transmission chain, and the targeting frameworks.
A central bank is a sole supplier of legal tender, banker to the government and to commercial banks, regulator and supervisor of the payments system, lender of last resort, and conductor of monetary policy. Five hats.
The primary objective is price stability, typically operationalized as 2% inflation in developed economies. Other common objectives include full employment (the Fed's "dual mandate"), financial stability, currency stability, and moderate long-term interest rates.
KEY: Most central banks pursue a single explicit inflation target. The Fed is the prominent exception, balancing inflation and employment by statute.
Three conventional tools plus the unconventional toolkit added after 2008.
Open market operations (OMO). The central bank buys or sells government securities. Buying injects reserves, lowers short rates, expands the money supply. Selling does the reverse. This is the daily workhorse.
Common mistakes
- Confusing the policy rate with the money supply. Cutting the policy rate is the signal; OMO purchases are the mechanism that delivers the rate. Trap: "raising reserve requirements lowers interest rates."
- Reversing the currency direction. Expansionary policy weakens the currency. Contractionary strengthens it. Trap: "the Fed cut rates, so the dollar should strengthen on stimulus expectations."
- Forgetting the lag. Policy works with a 12 to 18 month delay. Trap: judging a recent rate hike by next month's CPI print.
Bottom line
- Primary central bank objective is price stability; secondary objectives include full employment, financial stability, currency stability, and interest rate stability.
- Three core tools: open market operations (daily), policy rate (meeting signal), reserve requirements (rare); QE and forward guidance extend the kit at the zero lower bound.
- Transmission: policy rate to market rates to asset prices, credit, wealth, and exchange rate to AD to output and inflation.
- Expansionary policy lowers rates, raises asset prices, weakens the currency, and lifts output and inflation; contractionary policy reverses every one of these.
Exam shortcut
Memorize the direction table: expansionary lowers rates, raises asset prices, weakens currency, raises AD and inflation. Reverse for contractionary. For policy mix questions, ask which sector is expanding (private under easy money, public under easy fiscal) and which is crowded out.
The full lesson (about 2,105 words, 14 min read) adds 1 worked example, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- monetary policy
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