Liquidity Risk
What is Liquidity Risk?
Liquidity risk is the risk of being unable to meet cash obligations on time, either because assets can't be sold quickly or funding dries up.
For a bank, liquidity risk arises from maturity transformation: deposits can be withdrawn instantly while loans are locked up long-term, so a surge of withdrawals can leave the bank short of cash even if it is solvent. This is what turns a loss of confidence into a bank run. It differs from credit risk (default) and interest-rate risk (rate moves).
Liquidity Risk: a worked example
A bank's balance sheet shows $30 million in cash and reserves, $70 million in marketable securities, and $420 million in long-term mortgage loans, so assets total $520 million. Against that sit $500 million of demand deposits and $20 million of equity, so the bank is solvent: assets exceed deposits by $20 million. Rumors spread and 25% of depositors demand their money at once, which is 0.25 × $500 million = $125 million. Liquid resources cover only $30 + $70 = $100 million, leaving the bank $25 million short. Mortgages sold in a hurry fetch 80 cents on the dollar, so the bank must dump $25/0.80 = $31.25 million of face value to raise the cash, booking a loss of $31.25 - $25 = $6.25 million against $20 million of equity. Solvent on paper, and still nearly broken by a timing problem.
The mistake students make with liquidity risk
Illiquidity gets treated as the same thing as insolvency. The two look alike from outside, since both end with a bank that cannot pay and both get described as a failure. Insolvency means assets are worth less than liabilities, so the bank is broke however much time it is given. Illiquidity means the assets are worth enough but cannot be converted to cash fast enough to meet today's withdrawals. Central bank lending against good collateral can cure illiquidity, and it cannot cure insolvency.
Liquidity Risk questions
What causes liquidity risk at a bank?
Maturity transformation causes it. Banks fund long-term illiquid assets such as mortgages and business loans with deposits that can be withdrawn on demand, so the timing of cash coming in never matches the timing of cash going out. The risk turns into a crisis when funding dries up, either because depositors withdraw in a panic or because other banks and money market lenders stop rolling over short-term funding. Holding cash, reserves, and easily sold securities is the buffer against that mismatch.
How is liquidity risk different from credit risk?
Credit risk is the chance a borrower defaults and a loan is never repaid, which destroys value on the asset side of the balance sheet. Liquidity risk is the chance a bank cannot turn good assets into cash fast enough to meet its obligations, a timing problem rather than a value problem. A bank whose loans will all be repaid in full can still fail if withdrawals arrive faster than those loans mature. Interest rate risk, a third category, covers losses when rate moves cut the market value of assets already on the books.
How do banks manage liquidity risk?
Banks hold a buffer of cash, central bank reserves, and government securities that can be sold or pledged within a day. They also spread funding across retail deposits, term borrowing, and interbank lines so that one source drying up is survivable, and they run stress tests estimating outflows under a panic. Deposit insurance reduces the incentive for depositors to run in the first place, and the central bank's discount window is the backstop when a solvent bank still needs cash today.
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Common comparisons
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