Few concepts are as fundamental – and yet so widely misunderstood – in global finance as "fractional-reserve banking." It is the silent engine that drives modern credit creation, liquidity, and economic growth, but it also represents a systemic risk if it is poorly understood or mismanaged.

Essentially, fractional-reserve banking refers to the practice where commercial banks are only required to hold a fraction of customer deposits in reserve, while the remainder is used for lending or investment purposes. This system allows banks to create new credit by multiplying the initial deposits throughout the economy – a process known as the money multiplier effect, or deposit multiplication.

For example, when a customer deposits 1,000 euros, the bank may only hold 10% (100 euros) in reserve and lend out the remaining 900 euros. These 900 euros can then be redeposited and re-lent multiple times, creating thousands of loans from a single initial deposit. While this stimulates economic activity, it is also highly dependent on public trust, careful liquidity management, and central bank oversight.

Unlike historical systems that mandated a fixed reserve ratio, today's modern regulations – such as the Liquidity Coverage Ratio (LCR) and the Net Stable Funding Ratio (NSFR) within the framework of Basel III and IV – focus on ensuring that banks are able to meet their short-term and long-term obligations even in stressed situations.

However, the fractional model means that depositors are, in effect, unsecured creditors, because deposits become liabilities of the bank. In crisis situations, such as the global financial crisis of 2008 or the Cypriot banking crisis of 2013, this financial structure can exacerbate instability. Nevertheless, this system remains the global standard – it enables credit expansion, financial intermediation, and capital formation on a scale that no other model can currently match.

As central banks explore the future of money through central bank digital currencies (CBDCs) and proposals for narrow banking, the debate about the appropriate level of leverage and risk within deposit-based systems is once again coming to the forefront. As long as the public trusts the banking sector, fractional-reserve banking remains the foundation of the world's monetary architecture – effective, powerful, and delicately balanced.

Read more in the first part of our gnews.cz series.

Part 1: The collapse of the global bond market: Why did a forty-year era of stability end, and what does it mean for you? More here

Part 2: Who is the real owner of your bank deposits? According to EU law, it is not you. More here

Part 3: Do you actually own the money in your bank account? The legal reality across the EU, and what happens to your money in the event of a banking crisis. Read more here

gnews.cz – GH