Monetary vs Fiscal Policy

Governments and central banks both try to steer the economy, but with different tools. Monetary policy, run by independent central banks, works through interest rates, money supply and credit conditions. Fiscal policy, run by elected governments, works through spending, taxes and borrowing. Sometimes the two push in the same direction, as during the 2020 pandemic; sometimes they pull in opposite directions. Understanding both helps traders interpret growth, inflation, bond yields and currencies.

Side by side#

How monetary policy works#

Lower interest rates make borrowing cheaper, encouraging spending and investment; higher rates do the opposite. Bond purchases (quantitative easing) push down long term yields. See Interest Rates and Quantitative Easing and Tightening.

How fiscal policy works#

Fiscal deficits are financed by issuing government bonds, which increases bond supply. See Treasury Bills, Notes and Bonds.

When they work together#

When they conflict#

If a government runs large deficits while the central bank is raising rates to fight inflation, the two policies pull in opposite directions. Large deficits can keep demand strong, forcing the central bank to keep rates higher for longer, and heavy bond issuance can push long term yields up.

Fiscal dominance#

Economists worry about fiscal dominance: when government debt is so large that the central bank feels pressure to keep rates low to make borrowing affordable, compromising its inflation goal. Concerns about debt sustainability can raise term premiums on long term bonds.

The UK mini budget, 2022#

In September 2022, the UK government announced large unfunded tax cuts. Gilt yields jumped sharply, the pound fell to a record low against the dollar, and pension funds using leveraged liability driven investment strategies faced collateral calls. The Bank of England intervened with temporary bond purchases, and the plan was largely reversed. The episode showed how markets can discipline fiscal policy. See Interest Rate Swaps.

What traders watch#

Frequently asked questions#

What is the difference between monetary and fiscal policy?#

Monetary policy uses interest rates and money supply, managed by central banks; fiscal policy uses government spending and taxes, decided by governments.

Which is faster, monetary or fiscal policy?#

Monetary decisions can be made quickly but affect the economy with lags; fiscal changes take longer to agree but direct payments can work fast.

How does fiscal policy affect bond markets?#

Larger deficits mean more government bond issuance, which can raise yields, especially if investors worry about debt sustainability.

Next, learn how central banks buy bonds in Quantitative Easing and Tightening.