Monetary policy encompasses central bank actions to manage economic growth, inflation, and employment through interest rate adjustments, money supply controls, and financial system oversight. Policy decisions significantly impact currency values, bond prices, equity markets, and commodity prices. Understanding monetary policy helps predict market movements and assess economic conditions.

Central banks use various tools including federal funds rates, quantitative easing, forward guidance, and reserve requirements to influence economic activity. Policy changes often create immediate market reactions as traders adjust positions based on new interest rate expectations. Monetary policy divergence between countries drives currency movements and international capital flows.

Real-world example: Federal Reserve raises interest rates by 0.75% to combat inflation, causing USD to strengthen, bond yields to rise, and growth stocks to decline as investors adjust to higher discount rates and tighter monetary conditions.