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

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

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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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.

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.

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.

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.

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.

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.

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

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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.

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.

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

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.

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.

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.

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.

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.

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.

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.

‘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.

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

Before the modern banking system, most lending resembled private credit

Before the creation of the modern banking system, the majority of loans were negotiated directly between the lender and the borrower—effectively making them private credit transactions.

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 the credit scoring system could change

Factoring rental payments into credit scores is just one proposed change some have suggested making to today’s credit scoring system to cater the system to renters as well as homeowners.

The private credit industry offers nonbank loans directly to businesses, particularly privately held midmarket companies.

The private credit industry—which offers nonbank loans directly to businesses, particularly privately held midmarket companies—grew from a $250B asset class in 2010 to around $1.5T in early 2024.

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.

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.

Direct lending typically involves 'senior loans'

Direct lending, the most common subtype of private credit, typically involves senior loans which are secured by a company's assets. "Junior capital," on the other hand, is a type of private credit that is not secured by a company's assets, making it generally riskier than direct lending.

Find out ways to get lower rates on private loans, such as applying with a cosigner

More borrowers are being pushed to opt for private student loans as changes to federal borrowing caps and repayment plans are implemented. Private lenders typically advertise interest rates that fall anywhere between sub-3% and 15% or higher.

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.

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

Why private credit has faced challenges in recent years

The factors that some experts say are driving what could be private credit's most challenging era since the 2008 financial crisis include global economic uncertainty around trade and tariffs, investor fears about the amount of money being spent on artificial intelligence, and more.

Getting prequalified or preapproved for a loan is typically step one in securing a home loan

While prequalification and preapprovals give buyers an idea of the type of loan offer they might expect, the prequalification process is much more straightforward than getting preapproved. However, some real estate agents require buyers to get preapproved, and some sellers may take a buyer's offer more seriously.

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.