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FRM Exam Part I · Anatomy of the Great Financial Crisis of 2007-2009

Shadow Banking, Leverage and Liquidity Runs Explained

Updated 11 October 2026 · Fact-checked

Shadow banking is credit intermediation outside the regulated deposit-taking banking system. It funded long-term, illiquid assets with short-term wholesale debt such as repo and ABCP, using high leverage. When lenders refused to roll that funding over, a run followed. To solve questions, trace the asset, the funding, the leverage and the trigger.

Understand Shadow Banking, Leverage and Liquidity Runs

A traditional bank takes deposits, lends long and holds capital. Deposit insurance and a central bank backstop reduce the chance of a run. The shadow banking system copied this job without those protections. It included SIVs, ABCP conduits, money market funds, broker-dealers and other finance vehicles. They bought long-term assets such as mortgage-backed securities and paid for them with short-term borrowing.

Maturity transformation means funding long-dated assets with short-dated liabilities. It works while lenders keep rolling over their loans. It fails when they stop. A SIV or conduit might hold securities for years but issue ABCP that matures in days or weeks. If investors will not buy new paper, the vehicle must sell assets or draw on a liquidity line from a sponsor bank. That pulled the risk back onto bank balance sheets.

Repo is a sale of a security with a promise to repurchase it later at a higher price. Economically it is a secured loan. The lender takes the security as collateral and lends less than its value. That difference is the haircut. Dealers rolled overnight repo each day. When collateral values became uncertain, lenders raised haircuts or refused to lend. A rise in haircuts acts like a margin call.

Leverage magnifies both gains and losses. A firm with assets of 30 times its equity is wiped out by a loss of about 3.3% of assets. Falling prices forced forced selling, which pushed prices lower, which forced more selling. This is the loss spiral and the margin spiral.

A repo run resembles a bank run, but the runners are wholesale lenders, not retail depositors. Their loans are secured and uninsured, and the run happens through haircuts and refusals to roll, not queues at branches. Both involve a first-mover advantage: those who leave first are paid in full.

Key formulas to remember

Leverage ratio
Leverage = Total assets ÷ Equity
Higher leverage means a smaller fall in asset value wipes out equity.
Equity wipe-out threshold
Asset fall that eliminates equity = 1 ÷ Leverage
With leverage of 20, a 5% fall in assets eliminates equity.
Return on equity under leverage
ROE ≈ Leverage × Asset return − (Leverage − 1) × Cost of debt
Use it to show how leverage magnifies gains and losses.
Repo haircut
Haircut = (Collateral value − Loan amount) ÷ Collateral value
Loan amount = Collateral value × (1 − haircut).
Equity needed to fund collateral
Equity needed = Collateral value × haircut
A higher haircut forces a borrower to fund more with its own capital or sell assets.
Maturity mismatch (concept)
Long-term illiquid assets funded by short-term liabilities that must be rolled
This is a rollover risk, a form of funding liquidity risk.

How to solve Shadow Banking, Leverage and Liquidity Runs questions

Use this sequence for any question on shadow banking, leverage or runs. It keeps you from confusing the assets, the funding and the trigger.

  1. 1Identify the entity: SIV, ABCP conduit, broker-dealer, money market fund or regulated bank.
  2. 2List its assets and their maturity and liquidity, for example long-term MBS.
  3. 3List its funding and its maturity, for example overnight repo or 30-day ABCP.
  4. 4Name the mismatch: maturity transformation, liquidity transformation, or both.
  5. 5Calculate leverage as assets ÷ equity and the loss that wipes out equity as 1 ÷ leverage.
  6. 6Find the trigger: doubts about collateral quality, higher haircuts, or lenders refusing to roll.
  7. 7Trace the amplification: forced sales, falling prices, more margin calls, and the pull-back onto sponsor banks.
  8. 8Pick the answer that matches the mechanism, not just the headline word 'run'.

Quickest way: Asset, funding, leverage, trigger

When to use it: Use it for conceptual multiple-choice questions where you must pick the best description of a vehicle or a run.

  1. Ask what it holds and for how long.
  2. Ask how it is funded and for how long.
  3. If funding is shorter than assets, it is exposed to a run.
  4. For numbers, compute 1 ÷ leverage or the haircut and stop.
  5. Rule out options that say the entity had deposit insurance or central bank access.

Common mistakes in Shadow Banking, Leverage and Liquidity Runs

  • Treating a repo run as the same as a retail bank run

    Both are called runs and both are about confidence.

    Fix: Remember the repo run is by wholesale lenders, on secured and uninsured funding, and it shows up as higher haircuts or refusal to roll.

  • Saying repo lenders lose money because the borrower defaults on an unsecured loan

    Repo is mixed up with unsecured lending.

    Fix: Repo is secured by collateral. Lenders ran because collateral values were uncertain and hard to sell, so they demanded bigger haircuts.

  • Computing leverage as debt ÷ equity when the question gives assets ÷ equity

    Leverage definitions differ.

    Fix: Use the definition in the question. Assets ÷ equity = 1 + debt ÷ equity. The wipe-out loss is 1 ÷ (assets ÷ equity).

  • Thinking SIVs had no link to banks

    SIVs were off balance sheet, so they seemed separate.

    Fix: Sponsor banks gave liquidity support and faced reputational pressure, so losses and funding needs returned to the banks.

  • Confusing a rise in haircut with a fall in the interest rate

    Both are terms of the repo.

    Fix: The haircut is the collateral cushion. A rise cuts the cash the borrower gets against the same collateral.

  • Calling maturity transformation inherently bad

    Crisis stories stress the failures.

    Fix: It is a normal function of banks. The danger comes from reliance on short-term funding without a stable backstop.

Worked examples

Example 1

A conduit holds $500 million of mortgage securities. It is funded by $485 million of ABCP and $15 million of equity. (a) What is its leverage? (b) What percentage fall in asset value wipes out its equity?

Show the solution
  1. Leverage = Total assets ÷ Equity = 500 ÷ 15 = 33.33.
  2. Wipe-out fall = 1 ÷ Leverage = 1 ÷ 33.33 = 0.03, or 3%.
  3. Check: 3% of $500 million = $15 million, which equals the equity.

Answer: Leverage is about 33.3 times, and a 3% fall in asset value eliminates the equity.

Example 2

A dealer funds a $200 million bond portfolio in overnight repo with a 2% haircut. The haircut rises to 10%. How much more equity or other funding must the dealer find to keep the portfolio, assuming the collateral value stays at $200 million?

Show the solution
  1. At a 2% haircut, cash borrowed = 200 × (1 − 0.02) = $196 million.
  2. At a 10% haircut, cash borrowed = 200 × (1 − 0.10) = $180 million.
  3. Funding gap = 196 − 180 = $16 million.
  4. Check: equity needed rises from 200 × 0.02 = $4 million to 200 × 0.10 = $20 million, a rise of $16 million.

Answer: The dealer must find an additional $16 million, or sell assets.

Exam tips

  • Questions often ask you to choose between a bank run and a repo run. Look for the words secured, wholesale, haircut and rollover.
  • Always compute the wipe-out loss as 1 ÷ leverage. It is quick and often tested.
  • Link the topic to amplification: forced sales, falling prices and margin spirals.
  • Remember that SIV and conduit risk returned to sponsor banks through liquidity lines.
  • Read whether leverage is given as assets ÷ equity or debt ÷ equity before you calculate.

Practice questions from Anatomy of the Great Financial Crisis of 2007-2009

Shadow Banking, Leverage and Liquidity Runs in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Shadow Banking, Leverage and Liquidity Runs: frequently asked questions

What is the shadow banking system in simple terms?

It is lending and credit creation done outside regulated, deposit-taking banks. Examples include SIVs, ABCP conduits, money market funds and broker-dealers. They borrowed short-term in wholesale markets to hold longer-term assets, without deposit insurance or a central bank safety net.

What was the repo run in 2008?

Lenders in the repo market became unsure about the value of mortgage-related collateral. They raised haircuts or refused to roll over loans. Borrowers had to sell assets or find other funding quickly, which deepened the crisis.

How did leverage amplify the crisis?

High leverage meant small losses in asset values wiped out a large part of equity. Firms sold assets to reduce debt, which pushed prices lower and created further losses and margin calls. Losses spread across institutions.

What is the difference between a bank run and a repo run?

A bank run is by depositors, often insured and retail, who withdraw cash. A repo run is by wholesale secured lenders who refuse to roll over loans or demand larger haircuts. The common feature is that short-term funding disappears when confidence falls.