Concept
Bank Run
Economics & FinanceWhat is a bank run?
A bank run occurs when a large number of depositors simultaneously withdraw their funds from a financial institution due to fears of insolvency. Because banks operate on fractional reserve models and hold illiquid assets, sudden surges in withdrawal requests can rapidly exhaust cash reserves and force the bank into failure.
In short
A bank run is a liquidity crisis caused by a collective loss of depositor confidence in a lending institution. When depositors rush to recover balances simultaneously, even fundamentally solvent institutions can collapse under immediate cash demands. Modern digital banking and social media communication have dramatically accelerated the speed and severity of these panics.
Key facts
- What triggers a bank run?
- A bank run is typically triggered by news or rumors that a bank possesses bad investments or insufficient liquid reserves to cover deposits.
- Why are fractional reserve banks vulnerable to runs?
- Because banks lend or invest the vast majority of deposits into long-term assets, retaining only a small fraction as immediately available cash.
- What modern twist on the bank run is highlighted in Issue 7?
- The editorial highlights how the March 2023 collapse of Silicon Valley Bank unfolded at unprecedented digital speed through online banking and viral social media posts.
Overview
A bank run represents an acute failure of institutional confidence within a fractional-reserve banking system. When depositors suspect that their institution is threatened by bad loans or bond depreciation, each individual possesses a rational incentive to withdraw funds before reserves run dry. Historically, this involved physical queues of panicked savers outside retail branches seeking physical banknotes. In the contemporary financial era, digital clearinghouses, mobile banking apps, and instant communications allow depositors to pull billions of dollars within hours, turning localized concerns into instant systemic emergencies.
In the Agency editorial
Issue 7 analyzes the March 2023 collapse of Silicon Valley Bank as a classic bank run amplified by digital technology. Thiago Patriota points out that venture-backed startup founders coordinated withdrawals on online networks, draining billions in deposits within hours. The editorial explains how SVB had invested customer deposits in long-term treasury bonds that lost market value when benchmark interest rates rose.
Source editions
Where this entry comes from in the Agency editorial.
Also from these editions: concepts
Related terms
- Bailoutnoun
- An emergency provision of financial assistance to a failing company, bank, or economy to prevent insolvency.
- Volatilitynoun
- The liability to change rapidly and unpredictably, especially in the market price of an asset or security.
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Sources
- Issue.7 - Economy in Crisis Pt.1 (opens in a new tab), Agency Brasil