Maturity transformation and liquidity spirals

Taken in short, lent out long — the oldest business in finance, in a form with no central bank behind it.

This lesson has had no expert review. It was written for this platform and against the evidence it cites; nobody has gone through it independently.

Learning objectives

You can spot maturity transformation in an on-chain position even where no term is stated.
You can describe the feedback that turns a withdrawal into a spiral.
You can say which mechanism does not take the lender-of-last-resort role here.

Check your prior knowledge

Answer these for yourself before reading on. Wherever you hesitate is where this lesson pays off.

Why can a bank not pay out all deposits at once?
What happens to the rate when many withdraw at once?
Who steps in when a market temporarily has no buyers?

Core concept

Fact

Maturity transformation with no stated term

A lending market takes in deposits withdrawable at any time and places them in loans with no fixed term that also do not come back on demand. So the same maturity mismatch exists as in a bank, only without the words: the deposit side says “any time”, the loan side says “when the borrower sees fit, or on liquidation”.

Fact

The rate is the balancing mechanism here

Where a bank makes people queue, here the rate rises: the less is free, the more expensive borrowing becomes and the more attractive depositing. That is a genuine balancing mechanism, but a price-based one — it does not procure capital, it makes providing capital more rewarding. If nobody wants to provide, it stops working, and quantity comes to the fore again.

Risk

The spiral has four steps

First the price of a widely used collateral asset falls. Second, collateralized positions move towards their liquidation threshold. Third, collateral is sold, pushing the same price down further. Fourth, that moves further positions to their threshold. Each step is intended and correct on its own; the feedback between step three and step one is why the outcome is larger than the trigger.

Uncertainty

There is no office that stops the spiral

In the classical system there are institutions that deliberately trade against the market in such a situation — not because it pays, but because it is their remit. On-chain that role is absent. What remains are buyers who buy when it pays them; whether that happens in time is not a question of mechanics but of market conditions. This is not a flaw in the code — it is a property of the construction, and it belongs in the assessment.

Definitions

Maturity transformation: Lending out long what was taken in short — the core of banking and of its vulnerability.
Liquidation threshold in the glossary: The debt-to-collateral ratio at which a position is closed by force.
Feedback: A relationship in which the consequence of a move reinforces its cause.

Model

Collateral price falls
Positions reach the liquidation threshold
Collateral is sold
Selling pressure pushes the same price — back to step one

The feedback loop — The loop ends when the remaining positions are far enough from the threshold, or enough buyers appear — not through an intervention.

Formulas

Withdrawal coverage

coverage = free_balance / largest_depositor

free_balance: The part of deposits not lent out
largest_depositor: Balance of the single largest depositing address

Limit: Below one means: a single withdrawal can end immediate availability for everyone else. The metric says nothing about whether that depositor wants to withdraw, and it understates the situation when several addresses belong to one party.

Worked example

An 8 % trigger, a 22 % outcome

Collateral price decline: 8 % in two hours
Positions near the threshold: USD 140m of debt
Tight-band depth for this collateral: USD 26m
Further positions per 2 % of decline: about USD 30m of debt

The first liquidation wave sells more collateral than the tight band absorbs; the price falls further. Each further 2 % of decline brings about USD 30m of debt to the threshold, whose collateral is sold in turn.

The end point sits well below the trigger without any participant having done anything unforeseen.

Reading: The decisive number is liquidatable debt against collateral depth — 140 to 26. It is measurable in advance and says whether the mechanism works against itself under stress. It does not say whether the trigger occurs.

Retrieval

No — with no stated term there is no mismatch.Yes — the deposit is withdrawable at any time while the loan does not return on demand.Only if utilization is above 90 %.

The buyer who buys when it pays.An office that deliberately trades against the market in such a situation because that is its remit.The ability to liquidate positions.

Exercise on real data

Use the guiding questions to determine which figures would be needed to estimate a market's liquidatable debt.

Dimension 7: economics →

Application

Write down the two metrics with which you would monitor this risk for a lending market on an ongoing basis — and say what they do not deliver.

Related case studies

Institutional reading

Bank: How does this mismatch differ from the one you already manage?
Insurance: Would a spiral be one event or a chain of events under your policy?
Asset management: Which exit condition would trigger before the second wave?

Metrics in this lesson

Key takeaways

Maturity transformation arises from availability, even where no term is stated.
The rate balances through price; it does not procure capital.
Liquidatable debt against collateral depth is measurable in advance.