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

Origins of the 2007-2009 Financial Crisis Explained

Updated 11 October 2026 · Fact-checked

The 2007-2009 crisis grew out of a US housing boom fed by low interest rates, weak lending standards and rapid growth in subprime mortgages. Lenders sold these loans into securitizations, so risk spread through the system. When house prices stopped rising, defaults surged. To answer exam questions, link each cause to the incentive behind it.

Understand Origins of the 2007-2009 Financial Crisis

The crisis did not start with one event. It built up over several years as housing credit expanded faster than borrowers' ability to repay. Think of it as a chain: cheap money, rising house prices, looser lending, and then securitization that moved the loans to investors worldwide.

Low interest rates. After the early-2000s downturn, policy rates in the US stayed low for an extended period. Cheap borrowing made mortgages affordable and pushed investors to search for higher yield. A large inflow of foreign savings into US fixed income also helped keep long-term rates low.

Housing boom. Rising house prices made lending look safe. If a borrower could not pay, the lender expected to recover the loan by selling a house worth more than the loan. This belief that prices would keep rising was the central assumption, and it reinforced itself: easy credit lifted demand, which lifted prices, which encouraged more credit.

Lax lending standards and subprime growth. Subprime borrowers have weak credit histories. Lenders offered them high loan-to-value loans, low or no documentation loans, and adjustable-rate products with low initial "teaser" rates. Many borrowers could only afford the loan if they could refinance after house prices rose. Mortgage brokers and originators were often paid per loan made, not for how the loan later performed.

Securitization and weak incentives. Under the originate-to-distribute model, lenders sold loans to be pooled into mortgage-backed securities and structured products, then passed the credit risk to investors. This weakened the originator's reason to screen borrowers. Rating agencies gave high ratings to many senior tranches, and investors relied on them. Banks and funds also used high leverage and short-term funding, so a fall in house prices turned into a system-wide problem. Exam questions test whether you can name the cause and explain the mechanism.

Key formulas to remember

Loan-to-value (LTV) ratio
LTV = Loan amount ÷ Property value
A higher LTV means less borrower equity and bigger losses if prices fall. Subprime lending often used LTV at or near 100%.
Borrower equity
Equity = Property value − Loan balance
Equity turns negative (negative equity or "underwater") when the house is worth less than the loan.
Core causal chain to remember
Low rates → easy credit → house price rise → looser standards and subprime growth → securitization → hidden risk and leverage → price fall → defaults and losses
Use this as a memory frame for cause-and-effect questions. It is a summary, not a formula.

How to solve Origins of the 2007-2009 Financial Crisis questions

Most questions on this topic are conceptual or lightly numerical. Use this method to avoid being pulled by plausible wrong options.

  1. 1Read the stem and decide what it asks: a cause, a mechanism, a consequence or a calculation.
  2. 2Place the item in the chain: monetary conditions, housing, lending standards, securitization, or leverage and funding.
  3. 3Ask what incentive or assumption sits behind it, such as fees per loan or the belief that prices always rise.
  4. 4For numbers, compute LTV or equity with the formulas and check the direction: higher LTV means higher risk.
  5. 5Eliminate options that reverse cause and effect, such as saying defaults caused the housing boom.
  6. 6Eliminate absolute words like "only" or "solely". The crisis had many causes.
  7. 7Choose the option that matches both the cause and the correct mechanism.

Quickest way: Cause-to-mechanism check

When to use it: Use it for conceptual multiple-choice questions when you have about a minute per question.

  1. Name the cause in the option: rates, housing, standards, securitization or leverage.
  2. Say its mechanism in one phrase, for example "fee per loan weakens screening".
  3. If you cannot link the cause to a mechanism, mark the option as doubtful.
  4. For numeric questions, compute LTV as loan ÷ value and compare with the options.
  5. Pick the option with the right direction of effect.

Common mistakes in Origins of the 2007-2009 Financial Crisis

  • Treating low interest rates as the only cause.

    Rates are the easiest cause to remember, so students stop there.

    Fix: Remember it was a combination: low rates, housing boom, weak standards, securitization and leverage. Reject options that say "solely".

  • Saying subprime defaults alone caused the whole crisis.

    Subprime is the famous label, so it gets all the blame.

    Fix: Subprime losses were the trigger. Opaque securitization, high leverage and short-term funding spread and magnified them.

  • Confusing the originate-to-distribute model with the buy-and-hold model.

    Both involve making loans, so the difference in who keeps the risk is overlooked.

    Fix: In originate-to-distribute, the lender sells the loan and keeps little risk, so its incentive to screen borrowers falls.

  • Reversing the LTV effect.

    Students think a bigger loan against the same house means more collateral.

    Fix: A higher LTV means less cushion for the lender. Lower LTV means more equity and lower loss risk.

  • Assuming borrowers always defaulted because they could not afford the starting payment.

    Defaults are linked to affordability in general.

    Fix: Many borrowers coped with low teaser payments. Trouble came when rates reset and refinancing became impossible as prices stopped rising.

Worked examples

Example 1

A subprime borrower buys a house for $250,000 and takes a mortgage of $237,500. Calculate the loan-to-value ratio and the borrower's equity. If house prices then fall 10%, what is the new equity?

Show the solution
  1. LTV = Loan ÷ Value = 237,500 ÷ 250,000 = 0.95, or 95%.
  2. Initial equity = 250,000 − 237,500 = $12,500.
  3. After a 10% fall, value = 250,000 × 0.90 = $225,000.
  4. New equity = 225,000 − 237,500 = −$12,500 (ignoring any repayment of principal).
  5. Negative equity means the borrower is underwater and the lender cannot recover the full loan by selling the house.

Answer: LTV is 95%, initial equity is $12,500, and after a 10% price fall equity is −$12,500.

Example 2

Which of the following best explains why the originate-to-distribute model contributed to the build-up of the crisis? (A) It required lenders to hold all loans until maturity. (B) It reduced the originator's incentive to screen borrowers because the credit risk was sold on. (C) It limited the supply of mortgage credit. (D) It forced rating agencies to give low ratings.

Show the solution
  1. Identify the topic: incentives in securitization.
  2. Under originate-to-distribute, lenders sell loans to be pooled and securitized.
  3. Because the originator does not keep the credit risk, its reason to check borrower quality weakens.
  4. Option A describes buy-and-hold, the opposite of the model.
  5. Option C is wrong because the model expanded credit supply.
  6. Option D is wrong because many senior tranches received high ratings.

Answer: B

Exam tips

  • Learn the causal chain and be able to place any statement in it. Most conceptual questions test one link.
  • Watch for words like "only", "solely" and "always". They usually mark a wrong option here.
  • Be ready to separate the trigger (falling house prices and subprime defaults) from the amplifiers (leverage, opaque securitization, short-term funding).
  • For numeric questions, LTV and equity are quick calculations. Do them first and check the direction of the answer.
  • Study this topic together with securitization and the credit rating agency failures, since questions often mix them.

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

Origins of the 2007-2009 Financial Crisis in other exams

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

Origins of the 2007-2009 Financial Crisis: frequently asked questions

What were the main causes of the 2007-2009 financial crisis?

The main causes were a housing boom, a long period of low interest rates, weak lending standards and fast growth in subprime mortgages. Securitization spread the risk and high leverage magnified losses. No single factor explains it.

What is a subprime mortgage?

A subprime mortgage is a loan to a borrower with a weak credit history, usually at a higher interest rate. In the build-up to the crisis many were adjustable-rate loans with low initial rates and high loan-to-value ratios. They relied on rising house prices to stay safe.

Why did house prices matter so much?

Lenders and investors assumed prices would keep rising, so loans looked well covered by collateral. Borrowers also counted on refinancing against higher values. When prices fell, equity vanished, refinancing stopped and defaults rose.

How is this topic tested in FRM Part I?

Expect conceptual multiple-choice questions on causes, incentives and the link between housing, lending and securitization. Some questions add simple calculations such as loan-to-value. Knowing the chain of events and the mechanisms is the best preparation.