What a Bank Run Really Is—and Why Liquidity Disappears
Understand banking liquidity and deposit withdrawals through the documented 2023 Silicon Valley Bank failure.
Why banks hold assets instead of only cash
Banks take deposits and provide financing, hold liquid resources and manage liabilities. Much of a bank’s assets can mature later than depositors may want to withdraw their money. This maturity mismatch makes liquidity planning important.
An institution could own substantial assets but struggle to sell them fast enough at a reasonable price. Liquidity is about meeting payments on schedule; solvency concerns whether the economic value of assets can support liabilities.
Why bond prices react to rates
When current yields rise, the market value of existing fixed-coupon bonds typically falls. A bond bought in a low-rate environment can carry unrealized market losses after rate increases. Duration, hedging and accounting treatment influence the extent of the exposure.
A bank may plan to hold assets until maturity, but withdrawals can force it to raise cash sooner. Selling in stressed markets crystallizes losses that were previously unrealized.
The March 2023 Silicon Valley Bank failure
The Federal Reserve’s investigation records serious weaknesses in Silicon Valley Bank’s management of liquidity and interest-rate risk, a deposit base concentrated among technology and venture-capital customers, and supervisory shortcomings.
SVB was closed by California regulators on March 10, 2023. The Fed report describes an extraordinarily rapid run that included interconnected depositor networks. It is reductive to blame the failure on one bond investment or a single social-media message.
Why a run feeds on itself
Each depositor may withdraw because they believe others will withdraw. If enough money leaves rapidly, confidence itself becomes part of the institution’s liquidity problem. Payment technology can accelerate withdrawal requests.
The underlying vulnerability still matters: uninsured and concentrated deposit funding, mismatched asset maturities and inadequate planning make a confidence shock more dangerous.
What supervision and deposit protection do
Deposit insurance rules vary across countries, account structures and time. Supervisors oversee capital and liquidity risks, while central banks may support financial-system stability through defined facilities. These protections have limits and require precise local information.
A dramatic historical case should not be turned into universal advice to withdraw deposits. It should encourage understanding of the applicable safeguards, rather than panic.
Why this matters beyond banking
Households need emergency liquidity despite owning longer-term assets. Businesses need cash for wages despite having unpaid invoices. Banks face a larger, more complex version of the timing problem.
The lesson is to examine both the assets on a balance sheet and the speed at which contractual obligations can arrive.
Questions worth asking
How stable are the funding sources? What fraction can be withdrawn quickly? How sensitive are assets to interest-rate movements? What liquid reserves or borrowing arrangements are available in a stress scenario?
Avoid assuming that all banks with similar accounting losses face identical risk. Concentration, funding stability, hedges and oversight can change the outcome.
What to remember
These concepts provide general financial education; results for real businesses or households depend on their actual records, agreements and circumstances. Illustrations are hypothetical, not guaranteed outcomes.
Sources
Aadvik Agastya is the author and editor of Capilore’s financial storytelling library. His writing explores everyday money choices, business and corporate finance, financial systems, and the historical decisions…
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