What Is Liquidity Risk?
Liquidity risk covers two related exposures: market liquidity risk, being unable to sell an asset without accepting a materially worse price, and funding liquidity risk, being unable to meet obligations as they fall due. Solvent institutions fail from the second while holding assets worth more than they owe.
Liquidity risk is two problems wearing one label. One is about selling assets, the other about meeting obligations, and the reason they share a name is that each reliably produces the other.
How it works
Market liquidity risk is about the asset. You hold something worth 100 on paper and the only available buyer will pay 80, so the paper value is not a price you can obtain.
Funding liquidity risk is about you. An obligation falls due, the cash is not there, and no amount of being solvent on paper resolves it by the deadline.
Each produces the other. A funding shortfall forces selling into a weak market; forced selling depresses prices, which triggers margin calls at other holders and creates funding shortfalls for them.
Why solvency does not protect you
Solvency is about the balance sheet. Assets exceed liabilities, so in an orderly wind-down everybody is paid.
Liquidity is about the calendar. Assets realisable over five years cannot meet a liability falling due on Friday, whatever the totals say.
And the market does not wait. An institution that misses a payment is treated as failed regardless of its balance sheet, because counterparties cannot distinguish “will not” from “cannot yet.”
A worked example
A fund holds illiquid assets and offers daily redemptions. In calm conditions redemptions are modest and easily met from cash.
A period of poor performance triggers larger redemptions. The cash buffer is exhausted and the fund must sell holdings that take weeks to sell properly.
Selling quickly means selling badly, which lowers the reported value, which prompts further redemptions from holders who can now see the decline.
That loop is self-reinforcing and it has ended many funds. The mismatch was structural from the first day — daily liquidity promised against assets that never had it — and the calm period simply concealed it.
The mismatch is the design flaw
Banks run this deliberately. Deposits repayable on demand fund loans lasting decades, and the entire business model is that not everybody asks at once.
Which is why bank runs are self-fulfilling. The belief that others will withdraw is sufficient reason to withdraw, and a solvent bank can be finished by a belief.
Deposit insurance and central bank facilities exist for exactly this. They break the logic by removing the incentive to be first in the queue, and they are the reason bank runs became rare rather than the reason they became impossible.
Funds offering daily dealing on illiquid assets repeat the structure without the backstop. The mismatch is identical; the lender of last resort is not there.
The original data
On this site’s shared series a round trip costs 0.0098, about 2% of the median bar range of 0.493, and the largest bar is 2.338 with a ninetieth percentile of 1.101.
That round-trip figure is a calm-market measurement. In stressed conditions spreads widen by multiples and depth disappears, so the cost of liquidating is far above anything a normal-period estimate suggests.
And the drawdown figures show the duration: 95% of bars below a prior peak with a longest stretch of 73 bars. Liquidity has to be held through a period like that, not just on the day of a shock.
What actually defends against it
Hold cash. Genuinely unexciting and the only defence that works in every scenario, which is why it is the one most often trimmed during good periods.
Match maturities. Funding long assets with long liabilities removes the mismatch at the cost of flexibility and, usually, some return.
Committed facilities. A pre-agreed borrowing line is useful, and the ones that matter are the ones the lender cannot withdraw at the moment you need them.
And structural tools for funds. Notice periods, swing pricing and gates align what is promised with what the assets can deliver, and imposing them during a crisis is far more damaging than having them from the start.
How it is measured
The liquidity coverage ratio requires banks to hold enough high-quality liquid assets to survive a specified thirty-day stress, which came directly out of the 2008 experience.
The net stable funding ratio looks further out, requiring long-term assets to be funded by stable sources rather than by overnight borrowing.
And redemption stress testing applies assumed outflow rates to a fund and asks whether the portfolio could meet them without distressed selling.
All three specify a scenario rather than fit a distribution, which is the right approach for a risk whose defining feature is that its historical data contains few examples of what it is protecting against.
When it fails
The characteristic failure is a liquidity buffer sized against normal conditions. A treasurer models outflows on historical patterns, holds a buffer covering the worst month in the data, and is comfortable. In a genuine stress, outflows exceed anything in that history precisely because everybody is doing the same thing at once, while the assets earmarked for sale have become the hardest to sell. Both sides of the calculation deteriorate simultaneously, and they deteriorate because of the same event — which no model built on independent variation would ever predict.
A second failure is confusing solvency with liquidity. Being right about value does not pay a bill on Friday.
A third is relying on a facility that can be withdrawn, which is what happens when it is needed.
A fourth is offering daily dealing on assets that do not trade daily, which is a mismatch regardless of how long it goes unnoticed.
And a fifth is assuming a historically liquid market stays liquid. Depth is provided voluntarily, and the providers withdraw when it costs them.
Related
Liquidity covers the quality itself and how it is measured. Market risk covers the price exposure this one interacts with. And settlement risk covers a specific timing failure with the same shape.
More institutions have failed from liquidity than from being wrong. You can be right about every position you hold and still be finished, because somebody wanted their money on a Tuesday and the assets could not be turned into cash by Tuesday.
— Michael Whitman
This page is educational, not financial advice. Test every idea on your own charts before risking money.