A bank run happens when many customers try to withdraw their money from a bank at the same time because they fear the institution cannot meet its obligations. Since most banks keep only a fraction of deposits as readily available cash and lend or invest the rest, a sudden rush of withdrawals can overwhelm reserves and turn fear into a self fulfilling collapse.
How a bank run works
In traditional finance, banks rely on confidence and liquidity management. Depositors typically do not demand their funds all at once, so banks can operate with limited cash on hand. If rumors, losses, or a broader economic shock lead depositors to doubt solvency, they may withdraw early to avoid being last in line. Even a fundamentally healthy bank can be pressured if it cannot quickly raise cash without taking losses, while a weak bank can fail rapidly as withdrawals force asset sales and trigger more panic.
Bank runs in crypto, exchange runs, and stablecoin stress
Crypto markets can experience similar dynamics on centralized intermediaries such as exchanges, lenders, brokers, and custodians. These firms may promise instant withdrawals while holding client assets in wallets, lending them out, staking them, or using them as collateral. If users suspect the intermediary is undercollateralized or has taken excessive risk, they may rush to withdraw coins to self custody, creating an “exchange run.” Stablecoins can also face run like behavior when holders rapidly redeem for dollars or sell on secondary markets if they doubt the quality of reserves.
These episodes matter because they reveal the importance of liquidity, transparency, and custody. In crypto, proof of reserves, clear liability disclosures, prudent risk controls, and the ability to withdraw to self custody can reduce run risk and limit contagion across the ecosystem.