This lesson examines the role of central banks in financial systems and monetary policy implementation. Central banks are fundamental institutions in the modern financial system, responsible for monetary policy, financial stability, and oversight of payment systems .

4.1 The Functions of Central Banks
Central banks typically perform several core functions: monetary policy implementation, financial stability oversight, payment system oversight, and serving as banker to the government . The European Central Bank (ECB) and the Federal Reserve are the key central banking institutions in their respective regions, and their structures differ: the Federal Reserve operates a dual mandate of price stability and maximum employment, while the ECB’s primary mandate is price stability . Central banks also manage foreign exchange reserves and may intervene in currency markets . Understanding central banking is foundational to understanding the broader financial system .

4.2 Monetary Policy Instruments
Central banks use various instruments to implement monetary policy: interest rate setting, primarily through policy rates; open market operations, buying and selling government securities to manage liquidity; and reserve requirements, setting minimum reserves banks must hold . These tools influence credit conditions in the economy and ultimately affect inflation and employment . Quantitative easing (QE) emerged as a significant policy tool following the 2008 financial crisis .

4.3 Central Banks and Financial Stability
Central banks play a crucial role in maintaining financial stability . This includes oversight of systemically important financial institutions (SIFIs) and macroprudential regulation . Since the 2008 financial crisis, central banks have taken on expanded roles in micro- and macro-prudential supervision, with the ECB now directly supervising significant banks in the Eurozone under the Single Supervisory Mechanism (SSM) . Students examine the evolving relationship between central banks and financial stability, including post-crisis reforms .