To continue selling mortgages, agencies that determine how risky a loan is gave high ratings to homebuyers regardless of their actual risk portfolio.

Watch Margot Robbie explain subprime mortgages—risky loans given to homebuyers with low credit scores or no income verification.

Before the Great Recession, lax requirements to get a mortgage resulted in mass defaults that left nearly 19 million homes vacant.

Subprime lending practices, which fueled the housing bubble, surged after 2000.

Pioneered by JPMorgan, credit default swaps are a form of financial derivatives that act as insurance policies for banks issuing assets created with risky loans.

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To avoid a total collapse of the housing market, the US government took control of the two leading mortgage companies, Fannie Mae and Freddie Mac.

In 2024, 74% of homebuyers took out a mortgage

Debt owed on mortgages made up about 70% of US consumer debt as of 2025. Mortgage collateral ensures the lender isn’t at a complete loss if the borrower defaults. Under most mortgage contracts, the property is considered collateral under the loan. This means that if a borrower doesn’t repay the loan, then the lender can seize their property.

Historically, borrowing money from other people to purchase property was common until private financing companies—primarily building and loan associations—stepped in to offer mortgages to buyers.

Securitization has become common practice in home financing

When a homebuyer finances with a lender, they aren’t necessarily the one footing the bill. After a buyer secures a home loan, the lender can sell the loan to another financial institution or a private institution. That group can later sell that mortgage to investors. This is called securitization.

Mortgage insurance offers help to buyers who can’t afford to put down 20% up front

Buyers who need mortgage insurance end up paying more per month on top of their loan to cover the added insurance. At its core, mortgage insurance helps buyers purchase a home they can’t afford, letting them put down 20%, while protecting lenders offering potentially risky loans.

The rare, so-called 'assumable' mortgage is landing homebuyers a 3% rate.

Since the 1990s, banks have sold some of the credit risk of their accounts to external investors, known as SRTs, or synthetic risk transfers

This means if the account defaults, the outside investors assume most of the risk in return for some regular payments, freeing up the bank's ledger. It is a form of insurance used by banks to allow them to free up capital. In 2024, nearly $100B worth of SRT notes were sold.

The 2008 financial system unraveled in a wave of speculation

Michael Lewis—author of the bestselling "The Big Short"—explains how a wave of speculation (among other factors) drove the 2008 collapse, from lenders issuing risky mortgages to Wall Street turning them into fragile securities. He also highlights the few outsiders who recognized the bubble and bet against it before the crash.

Mortgages are loans used to buy property

A mortgage is a loan used to buy property, like a house. Borrowers typically put down a percentage of the cost of the home, and the amount left over is financed through a lender, like a bank.

Borrowers were increasingly defaulting on private credit loans as of early 2026

Risks in private credit investing include the industry's lack of transparency and the ability of businesses to borrow more than a bank might allow against their debt. Some borrowers in early 2026, for instance, likely did not expect interest rates to be so high for so long, which could be contributing to an uptick in defaults.

For much of human history, homeownership was primarily associated with the elite

Before the Industrial Revolution, early mortgages were rather exclusive loans given only to nobility. But as more people gained more wealth through the Industrial Revolution, banks began to take on “higher-risk” loans to everyday people.

In 2008, the 'Big Short' mastermind Michael Burry made more than $700M.

BlackRock played an integral role in the Federal Reserve's response to the Great Recession, managing about $30B of hard-to-sell Bear Stearns assets on behalf of the New York Fed.

The movie adaptation of ‘The Big Short’ provided a visual for the 2008 housing bubble

A scene from "The Big Short" visualizes how Wall Street bundled shaky mortgages into complex housing bonds and sold credit default swaps on top of them—showing, step by step, how the structure of the 2008 housing bubble was vulnerable to collapse.

Commonly referred to as the 'bank bailout,' the Troubled Asset Relief Program disbursed $443B in an attempt to keep the financial system solvent.

Some argue that credit reporting promotes economic inequality in the US

Although today's credit scoring system is much more objective than, say, the credit assessment system of the 1700s, some argue there's still room for improvement, with critics saying the current system is still discriminatory. For example, while mortgage payments have long been automatically reported to credit bureaus, rent payments (the primary housing expense for most lower-income Americans) historically haven't been reported unless a payment was missed.

American International Group, one of the largest insurance companies in the world, received $182B from the federal government—the largest of any bailout in the wake of the Great Recession.

US homeownership rates declined from the start of the Great Recession through 2016.

Fannie Mae and Freddie Mac are federal housing enterprises originally established to offer affordable housing loans to buyers

The Federal National Mortgage Association is commonly called Fannie Mae, and the Federal Home Loan Mortgage Corporation is called Freddie Mac. Since Fannie Mae’s creation in 1938 and Freddie Mac’s in 1970, they’ve become staples of the housing market.

Refinancing a mortgage is when a homeowner exchanges their current loan for a new one

Homeowners typically refinance to secure a lower interest rate and potentially a new loan term length. Debt owed on mortgages made up about 70% of US consumer debt as of 2025.

Read about why bans on short selling are a controversial policy

Generally, short selling is legal, but regulations often restrict short positions when a stock has experienced a sharp price decline (more than 10% in one day). However, negative feedback loops in times of financial crisis have given short selling a bad reputation. The government has temporarily banned short selling during previous market downturns—like The Great Recession of 2008 and the early months of the COVID-19 pandemic—but experts argue whether those bans actually improved market stability or just distorted prices.

Who is Michael Burry?

Michael Burry is best known for shorting the mortgage bond market in 2007. Before the Great Recession, the legendary investor’s firm took a stake in GameStop and argued the company was being undervalued in 2019. Learn more about Burry’s historical impact on markets here.

Investing in bonds comes with a few risks

Think: changes in interest rates that impact the bond’s value, or a bond issuer completely defaulting on a loan. There are steps investors can take to lower their initial and future risk when investing in the bond market, such as checking a company's bond rating before investing.

The word 'mortgage' comes from medieval French, meaning 'death contract.'

Watch Selena Gomez explain collateralized debt obligations in a clip from 'The Big Short.'

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Before Lehman Brothers filed for bankruptcy in 2008 with more than $600B in debt, the Federal Reserve tried to orchestrate a private deal to save the then-fourth-largest investment bank in the US.

Consequences of a bad credit score

A bad credit score can lead to spending roughly $100K more on a typical mortgage. Poor scores also prevent you from getting certain jobs, apartments, and more, hindering you from building wealth in the long term.

How interest rates affect homebuying

Rising interest rates impact every aspect of buying a home. This five-minute article gives a high-level overview of the relationship between the housing market and interest rates.

For everyday Americans, a relatively high national debt can lead to higher interest rates on financial products such as mortgages.

In the aftermath of the 2008 financial crisis, the Fed began a program of quantitative easing

This program injected trillions of dollars of new money into financial markets to stimulate the economy. The move catalyzed an 11-year bull run and was repeated during the pandemic. Experts argue such power could worsen wealth inequality and contribute to bubbles in housing and finance.

The term ‘mortgage’ was born out of the French word for ‘dead pledge’

Borrowing money to buy a house has been a global practice since the Romans in the fifth century BCE. But before the mortgage, there was the “dead pledge,” which labeled the property as “dead” to the borrower until they paid off their loan to the lender.

Why countries have credit ratings

Sovereign credit ratings work like national credit scores, measuring a country’s ability and willingness to repay its debt. Moody’s, S&P, and Fitch are the major agencies assigning these ratings, which influence borrowing costs and investor confidence.

The Federal Reserve fought the Great Recession primarily with quantitative easing and repurchasing agreements.

Learn about what causes economic bubbles, including how forces like cheap credit, soaring optimism, and feedback loops push asset prices far beyond fundamentals—until a single shock triggers panic, selling, and a rapid collapse.

Investors need a 'margin account' to short sell stock

Margin accounts are leveraged accounts through brokerage firms that allow investors to make trades without the full amount of capital on hand. Similar to a secured loan, margin accounts often require some form of collateral and typically have a cap on how much investors can borrow. However, trading with a margin account is much riskier than a traditional investment account. Fees and charged interest are due on margin accounts, regardless of trade performance, meaning it's possible for investors to lose more money than just their initial investment.

In March 2008, Bear Stearns was the first major bank to collapse in the Great Recession—leading to panic across the entire global financial system.

Roughly 37% of first-time US home buyers have student debt

When those people have extra money, they might wonder: Is it better to pay down my mortgage or my student loans first? This article argues that the answer depends on each loan's interest rate, among other factors.

The National Housing Act established the Federal Housing Administration

During the Great Depression, 1,000 homes were foreclosed on per day, and half of the mortgages across the country defaulted. To address this crisis, President Franklin D. Roosevelt signed the National Housing Act. It established the Federal Housing Administration, which is still around today and helps protect lenders and buyers.

Some semi-liquid private credit funds saw a surge in investor redemptions in early 2026

This raised red flags about the state of the private credit market at large. However, experts have cautioned that the idea that private credit is on the verge of collapse is overstated.

Private mortgage insurance protects the lender rather than the borrower

Also known as a “PMI,” private mortgage insurance may be required for those who have a conventional loan and put less than 20% down on their home. A PMI could also be required for someone refinancing their mortgage if they have less than 20% equity remaining in the property.

'Floating rate' loans periodically adjust their interest rates in accordance with economic conditions

When the Federal Reserve began raising interest rates in 2022 to combat inflation, interest payments borrowers owed to private credit lenders increased accordingly. Private credit funds benefited as loan returns increased, making the asset class attractive to investors at the time.

A margin call is a way for traders to pay off debts by selling a security before they may be ready to do so.

Some experts and investors think short selling—a strategy in which investors bet that a stock will drop in value—helps keep the market healthy.

Banks have increased small loan programs since 2018, upping competition for payday lenders

One of the reasons payday lending flourished for nearly two decades is that most banks charged high overdraft fees and didn't offer small loans. However, since 2018, banks have increased their small loan options. Supporters say this provides safer alternatives for consumers, as banks are subject to more regulatory measures and are less likely to allow consumers to keep rolling over loans.

‘The Giant Pool of Money’ remains one of the most acclaimed accounts of the 2008 housing bubble

This Peabody Award–winning "This American Life" episode traces how cheap global money, subprime lending, and Wall Street engineering inflated the housing bubble. Through vivid reporting and real voices, it became one of the defining works of 2000s financial journalism.

The Fed operates within the open market as a competitive bidder of interest rates

Because it’s viewed as a risk-free platform to earn interest, whatever rate it sets becomes the default benchmark. To maintain its target rate prescribed by the Federal Open Market Committee, the Fed has various tools it offers both commercial banks and home loan institutions.