At that time, large banks, freed from the Depression-era restrictions on securities trading, as well as investment banks, hedge funds and other institutions outside the traditional banking system, had heavily invested in mortgage-backed securities, a kind of bond backed by pooled mortgage payments from lots of homeowners. These bonds were highly profitable amid the housing boom of that era, and they helped many financial institutions reap record profits.

But the Federal Reserve had been increasing interest rates since 2004 to slow the economy. By 2007, many households with adjustable-rate mortgages could no longer afford to make their larger-than-expected home loan payments. That led investors to fear a rash of mortgage defaults, and the values of securities backed by mortgages plunged.

It wasn’t possible to know which investment banks owned a lot of these vulnerable securities. Rather than wait to find out and risk not getting paid, most of the depositors rushed to get their money out by late 2007. This stampede led to cascading failures in 2008 and 2009, and the federal government responded with a series of big bailouts.

The government even bailed out General Motors and Chrysler, two of the country’s three largest automakers, in December 2008 to keep the industry from going bankrupt. That happened because the major car companies relied on the financial system to provide potential car buyers with credit to purchase or lease new cars. But when the financial system collapsed, buyers could no longer obtain credit to finance or lease new vehicles.

The Great Recession lasted until June 2009. Stock prices plummeted by more than 50%, and unemployment peaked at around 10% – the highest rate since the early 1980s.

As with the Great Depression, the government responded to this financial crisis with significant new regulations, including a new law known as the Dodd-Frank Act of 2010. It imposed stringent new requirements on banks with assets above $50 billion.

Congress rolled back some of Dodd-Frank’s most significant changes only eight years after lawmakers approved the measure.

Notably, the most stringent requirements were now reserved for banks with more than $250 billion in assets, up from $50 billion. That change, which Congress passed in 2018, paved the way for regional banks like SVB to rapidly expand with much less regulatory oversight.

But still, how could SVB collapse so suddenly and without any warning?

Banks take deposits to make loans. But a loan is a long-term contract. Mortgages, for example, can last for 30 years. And deposits can be withdrawn at any time. To reduce their risks, banks can invest in bonds and other securities that they can quickly sell in case they need funds for their customers.

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