Bank Runs and Financial Contagion: Understanding Systemic…

What Are Bank Runs and Financial Contagion?

A bank run occurs when a large number of depositors withdraw their funds from a bank simultaneously due to fear that the bank may fail. This can lead to a chain reaction, where one bank's failure triggers defaults at other interconnected banks, known as financial contagion. The interbank network simulator illustrates how such events can spread through a system of banks.

In this context, each bank is part of a larger network where they lend and borrow from one another. When one bank faces liquidity issues, it may not be able to meet its obligations, leading to a cascade effect as other banks also face difficulties.

How Does Financial Contagion Occur?

Financial contagion occurs due to the interconnectedness of financial institutions. When one bank defaults or faces liquidity issues, it can lead to a decrease in its ability to repay loans and meet other obligations. This reduces the value of assets held by other banks that are owed money by the defaulting institution.

The interbank network simulator demonstrates how these effects propagate through the system, showing how even small shocks can have large impacts on the stability of the entire financial network.

live demo · related simulation● LIVE

Why Are Capital Buffers Important?

Capital buffers are reserves that banks hold to absorb potential losses without failing. They act as a buffer against unexpected events, such as bank runs or defaults in other institutions within the interbank network.

By adjusting capital buffers in the simulator, you can observe how increased reserves can reduce the likelihood and severity of financial contagion, highlighting their importance for systemic stability.

Real-World Examples

The 2008 global financial crisis is a prime example of how bank runs and financial contagion can lead to widespread defaults. The failure of Lehman Brothers triggered a chain reaction, causing other banks with significant exposure to Lehman to also face liquidity crises.

In recent years, central banks have implemented measures such as increased capital requirements for banks to mitigate the risk of systemic failures.

Frequently asked questions

What causes a bank run?

A bank run is often triggered by rumors or news that a bank may be insolvent, leading depositors to withdraw their funds before they lose value. This can happen due to mismanagement, fraud, or broader economic issues.

How does the interbank network simulator help in understanding financial stability?

The simulator helps visualize how shocks propagate through a network of banks and demonstrates the importance of capital buffers in preventing cascading defaults. It provides insights into systemic risk management strategies.

Can bank runs be prevented?

Bank runs can often be prevented by maintaining strong regulatory oversight, ensuring transparency, and implementing robust risk management practices. Central banks also play a crucial role in stabilizing the financial system during crises.

Why is understanding interbank networks important for policymakers?

Understanding interbank networks helps policymakers design effective regulations and interventions to prevent systemic failures. It aids in creating policies that promote stability while allowing banks to operate efficiently.

Try it live

Everything above runs in your browser — open Bank Runs & Financial Contagion — Interbank Network Simulator and change the parameters while it is running. Nothing is installed, nothing is uploaded, the whole model lives in one tab.

▶ Open Bank Runs & Financial Contagion — Interbank Network Simulator simulation

Bank Runs and Financial Contagion: Understanding Systemic Risk in Interbank Networks