monetary policy
Imagine the whole economy is a car, and the central bank is sitting at a single pedal. Press it down and money becomes cheaper and easier to borrow, so people and businesses spend more and the economy speeds up. Ease off and borrowing gets dearer, spending cools, and the economy slows. Monetary policy is the deliberate use of that pedal — the cost and availability of money and credit — to keep the economy from racing into high inflation or stalling into a deep recession.
In practice, monetary policy works mainly by setting a key short-term interest rate (the policy rate). When the central bank lowers that rate, banks can borrow more cheaply and pass cheaper loans on to households and firms; mortgages, car loans and business credit get cheaper, so spending and investment rise. This is called expansionary or 'loose' policy. When the bank raises the rate, the opposite happens — borrowing is dearer, spending falls, and price pressures ease. This is contractionary or 'tight' policy. The bank does not set every interest rate by decree; it nudges one rate and lets that ripple outward through the banking system.
Monetary policy is the most-watched lever in modern macroeconomics because a single committee meeting can move mortgage rates, stock markets and exchange rates worldwide within minutes. But it is a blunt and slow tool: changes can take a year or more to fully reach jobs and prices, and the bank cannot fine-tune the economy with surgical precision. It is distinct from fiscal policy, which is the government's choices about taxing and spending. Central banks control money and interest rates; governments control budgets.
When inflation surged after 2021, central banks across the world switched from loose to tight policy, raising their policy rates from near zero to around 5 percent in under two years — the fastest tightening in a generation — deliberately slowing spending to bring prices back under control.
Tight policy: raising rates on purpose to cool an overheating economy.
A common myth is that the central bank 'controls the economy.' It only sets one short-term rate; everything else — jobs, growth, even inflation — responds with long, variable and uncertain delays it cannot perfectly predict.