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Business Economics · Role, structure and stability of the financial system

Financial Instability, Crises and Systemic Risk Explained

Updated 11 October 2026 · Fact-checked

Financial instability is a state where the financial system cannot reliably channel funds or absorb shocks. Systemic risk is the risk that one failure spreads and damages the whole system. To answer exam questions, name the trigger, the amplifiers (leverage, runs, contagion, information gaps), the spread and the policy response.

Understand Financial Instability, Crises and Systemic Risk

The financial system moves money from savers to borrowers. It is stable when it keeps doing this even after shocks. It is unstable when a shock, such as falling asset prices, causes lenders to stop lending and institutions to fail.

Start with the causes. An asset bubble is a rise in prices well above fundamental value, driven by expectations of further rises. Leverage means using borrowed money to hold assets. Leverage magnifies gains, but it also magnifies losses. A small fall in asset prices can wipe out a highly leveraged firm's equity.

Then look at how trouble spreads. In a bank run, depositors fear a bank will fail, so they withdraw at once. Banks lend long and hold only a fraction of deposits as liquid assets, so even a sound bank cannot pay everyone on demand. The fear becomes self-fulfilling. Contagion is the spread of stress from one institution or market to others, through direct links (interbank loans, derivatives), through fire sales that push down asset prices for everyone, or through loss of confidence.

Information asymmetry makes this worse. Depositors and lenders cannot see a bank's true asset quality, so one bad news item leads them to doubt all similar banks. Lenders also face adverse selection (risky borrowers are the ones who apply) and moral hazard (borrowers or banks take more risk when others bear the loss, as with deposit insurance or expected bailouts).

Systemic risk is the risk of a breakdown of the whole system, not just one firm. It is high when institutions are large, interconnected and similar in their exposures. Liquidity risk is being unable to meet payments when due, even if assets exceed liabilities. Solvency risk is liabilities exceeding the value of assets. In 2008, falling US housing prices hit leveraged holders of mortgage-linked securities. Opaque exposures, short-term wholesale funding, and fire sales turned a housing downturn into a global crisis. Policy responses include central bank lending as lender of last resort, deposit insurance, capital and liquidity rules, and bailouts or resolution regimes.

Key rules to remember

Leverage ratio
Leverage = Total assets ÷ Equity
Higher leverage means a smaller fall in asset value wipes out equity.
Equity wipe-out fall in assets
Fall in asset value that eliminates equity (%) = 1 ÷ Leverage × 100
With leverage of 20, a 5% fall in assets removes all equity (ignoring other changes).
Solvency condition
Solvent if Assets ≥ Liabilities; insolvent if Assets < Liabilities
A bank can be solvent but illiquid if assets cannot be sold quickly at fair value.
Fractional reserve position
Liquid reserves ÷ Deposits = reserve ratio
If withdrawals exceed the reserve ratio, the bank must sell other assets or borrow.

How to solve Financial Instability, Crises and Systemic Risk questions

Use this structure for descriptive questions on a crisis, a bank run or systemic risk.

  1. 1Define the key term in one sentence (instability, systemic risk, liquidity risk or solvency risk).
  2. 2Identify the initial trigger or shock, such as a bubble bursting or a rise in defaults.
  3. 3List the amplifiers that made it worse: leverage, maturity mismatch, opaque exposures, information asymmetry, herd behaviour.
  4. 4Explain the transmission: runs, fire sales, interbank links, loss of confidence, and spread to the real economy.
  5. 5Distinguish liquidity problems from solvency problems for the institutions in the question.
  6. 6State the policy response and its drawback, such as lender of last resort, deposit insurance, capital rules, and moral hazard.
  7. 7If numbers are given, compute leverage, equity loss or reserve shortfall before writing your conclusion.
  8. 8Link your answer to the case or data in the question, rather than giving a generic list.

Quickest way: Trigger, amplifier, spread, response

When to use it: Use for short written questions and for MCQs asking you to identify the cause or type of risk.

  1. Trigger: what started it?
  2. Amplifier: leverage, mismatch, asymmetry?
  3. Spread: run, fire sale, contagion?
  4. Response: who steps in and what is the side effect?
  5. For MCQs, ask if the institution can pay now (liquidity) or owns less than it owes (solvency).

Common mistakes in Financial Instability, Crises and Systemic Risk

  • Treating liquidity risk and solvency risk as the same thing.

    Both can end in a bank failing, so they look alike.

    Fix: Liquidity is about timing of cash. Solvency is about assets versus liabilities. Check the balance sheet first.

  • Saying bank runs happen only to weak banks.

    Students assume depositors are fully informed and rational.

    Fix: Runs can be self-fulfilling. Because of information asymmetry, even a sound bank can face one if depositors fear others will withdraw first.

  • Blaming the 2008 crisis on a single cause.

    Textbook summaries often highlight only subprime lending.

    Fix: Give a chain: housing bubble, leverage, opaque securitised products, short-term funding, fire sales, contagion.

  • Confusing contagion with the original shock.

    Students describe losses but not how they spread.

    Fix: Name the channel: direct exposures, common asset holdings, or a collapse in confidence.

  • Listing bailouts and deposit insurance as pure benefits.

    The focus is on stopping the crisis.

    Fix: Always mention moral hazard: protection can encourage more risk-taking later.

  • Miscalculating the fall in assets that wipes out equity.

    Students divide by equity instead of total assets.

    Fix: The percentage fall in assets is Equity ÷ Assets, which equals 1 ÷ leverage.

Worked examples

Example 1

A bank has assets of ₹500 crore, funded by ₹475 crore of liabilities and ₹25 crore of equity. (a) Find its leverage. (b) By what percentage must asset values fall for the bank to become insolvent?

Show the solution
  1. Leverage = Total assets ÷ Equity = 500 ÷ 25 = 20.
  2. Insolvency occurs when assets fall to equal liabilities, 475 crore.
  3. Fall in assets = 500 − 475 = ₹25 crore.
  4. Percentage fall = 25 ÷ 500 × 100 = 5%.
  5. Check: 1 ÷ 20 × 100 = 5%.

Answer: Leverage is 20. A fall of just over 5% in asset value would make the bank insolvent.

Example 2

Explain why a solvent bank can still fail because of a bank run, and state two policy tools that reduce this risk.

Show the solution
  1. A bank takes short-term deposits and lends long-term, so it holds only a fraction of deposits as liquid reserves.
  2. If depositors fear loss, each has an incentive to withdraw first, because late withdrawers may get nothing. This is rational for each person, but harmful together.
  3. Information asymmetry means depositors cannot tell a sound bank from an unsound one, so the fear can spread across banks.
  4. The bank must sell long-term assets quickly at fire-sale prices. This causes losses that can turn a liquidity problem into a solvency problem.
  5. Tool one: deposit insurance, which removes depositors' reason to run. Drawback: moral hazard.
  6. Tool two: the central bank as lender of last resort, lending against good collateral to provide liquidity during the run.

Answer: A solvent bank fails in a run because of maturity mismatch and self-fulfilling fear. Deposit insurance and lender of last resort lending reduce the risk, though both can create moral hazard.

Exam tips

  • Define liquidity risk and solvency risk precisely. Many marks are lost on this distinction.
  • For 2008 questions, write a causal chain, not a list of unrelated factors.
  • When asked to evaluate a policy, give one benefit and one cost, such as moral hazard.
  • Show leverage calculations in full with the formula, because method marks are awarded in written answers.
  • Use the exact terms: adverse selection, moral hazard, contagion, fire sale, maturity mismatch.

Practice questions from Role, structure and stability of the financial system

Financial Instability, Crises and Systemic Risk: frequently asked questions

What is systemic risk in the financial system?

It is the risk that the failure of one institution or market spreads and disrupts the whole financial system. It is higher when firms are large, interconnected and hold similar assets.

What is the difference between liquidity risk and solvency risk?

Liquidity risk is being unable to pay obligations when they fall due, even if assets exceed liabilities. Solvency risk is when liabilities exceed the value of assets.

How do bank runs spread?

Depositors at one bank see others withdrawing, and because they cannot judge bank quality, they fear similar banks are at risk. Fire sales and interbank links also pass stress between banks.

What caused the 2008 financial crisis in brief?

A US housing bubble burst, hitting highly leveraged institutions that held opaque mortgage-linked securities funded by short-term borrowing. Losses, fire sales and lost confidence then spread across the global system.