2008, in detail

Most explanations of 2008 stop at "subprime mortgages" or "Wall Street greed." Both are true but explain almost nothing about why the system was structurally vulnerable to a 5% drop in housing prices producing a near-total financial collapse. The actual mechanism is more interesting and more important.

Simulation 1: Build a mortgage-backed security

Wall Street's central trick was financial alchemy: turn a pile of risky mortgages into a tower of "safe" securities by slicing the cash flows into tranches. Pull the levers below to see how junk got rated AAA — and how the ratings collapsed when actual defaults rose past what the models predicted.

Simulation 2: The crisis cascade

The system had multiple layers of leverage stacked on each other. Mortgages → MBS → CDOs → CDOs-squared → AIG insurance contracts → bank balance sheets → money market funds → real economy. Each layer multiplied losses from the layer below. Move the default rate slider and watch the cascade light up.

Simulation 3: The bailout allocator

Total US government and Federal Reserve commitments to financial institutions during 2008-2010 reached approximately $7.7 trillion (Bloomberg's lawsuit-extracted figure). Direct disbursements were smaller but still enormous: TARP $700B, AIG $182B, Fannie/Freddie ~$190B, Fed emergency facilities trillions in commitments. Compare that to homeowner relief — the population whose mortgages started the whole thing.

The story, fully assembled

2002-2006: The setup. The Fed kept rates extraordinarily low (1% in 2003-2004) following the dot-com bust and 9/11. Cheap credit poured into housing. Banks expanded subprime lending dramatically because they could sell the loans onward — a "originate to distribute" model that broke the link between underwriting quality and lender exposure.

2003-2007: The financial alchemy. Wall Street pooled mortgages into MBS, then took the lower tranches of MBS and re-pooled them into CDOs, then took the lower tranches of CDOs and re-pooled those into "CDO-squared." Each layer's senior tranche was rated AAA based on diversification mathematics that assumed mortgage defaults were uncorrelated. They weren't — when a national housing market turns, defaults correlate strongly.

2003-2008: AIG sells protection. AIG's Financial Products division wrote credit default swaps (CDS) — insurance contracts on MBS — without holding sufficient capital because regulators didn't classify them as insurance. Total notional exposure: $440 billion. AIG was structurally insolvent the moment housing turned but didn't know it because of accounting practices.

2007-2008: Subprime defaults rise. Housing prices peaked in mid-2006. Defaults began rising. By 2007 the lower tranches of MBS were taking losses. Bear Stearns hedge funds collapsed in summer 2007. Northern Rock failed in the UK. The system started showing stress.

March 2008: Bear Stearns. Bear Stearns, the smallest of the major investment banks but with $13.4 trillion in derivatives outstanding, faced a run on its short-term funding. Fed orchestrated a sale to JPMorgan with $29 billion of Fed financing. JPMorgan paid $10/share for a stock that had been $170 a year earlier.

September 6, 2008: Fannie and Freddie taken into conservatorship. Treasury committed up to $200B (eventually $190B used). The two GSEs guaranteed roughly half of US mortgages.

September 14, 2008: Lehman fails. No buyer found. No government rescue offered. Lehman declared bankruptcy on September 15. Largest bankruptcy in US history. Money markets immediately froze.

September 16, 2008: AIG saved. The Fed provided $85B initial credit facility (eventually $182B total). AIG's CDS exposures meant its failure would have cascaded through every major bank. AIG's counterparties — Goldman Sachs, Société Générale, Deutsche Bank — were paid 100 cents on the dollar by the Fed-backed AIG.

September 16, 2008: Reserve Primary Fund "breaks the buck." A money market fund's NAV dropped below $1 due to Lehman exposure. Treasury immediately guaranteed all money market funds. Without this, money market panic would have shut down commercial paper and collapsed the real economy in days.

October 2008: TARP passes. $700B in initial authorization. Used for direct equity injections into banks (TARP CPP, $204B), automakers (~$80B), AIG ($70B beyond Fed support), and ultimately mostly repaid with profit.

2009-2014: QE. Fed bought $4 trillion+ in Treasuries and MBS, expanding its balance sheet from $900B to $4.5T. Stock market began its longest bull run in history. Housing prices recovered, then exceeded prior peak in many markets.

The homeowner side. Approximately 10 million American families lost their homes to foreclosure between 2007 and 2014. The Home Affordable Modification Program (HAMP) was authorized for $75B. About $25B was actually disbursed. Most homeowners who applied for modification were denied. The architects of HAMP later admitted, on the record, that the program was designed to "foam the runway for the banks" — to slow foreclosures rather than prevent them, smoothing bank losses rather than helping families.

What it actually means

The 2008 crisis was not an accident. It was the product of specific regulatory choices (Glass-Steagall repeal, derivative deregulation, no-down-payment mortgages, rating agency conflicts), specific incentive structures (originate-to-distribute, executive comp tied to short-term profits), and specific Fed policy (extended low rates after 2001). Every step was legal at the time. Most of the architects faced no consequences. The total wealth destruction concentrated downward — homeowners and pensioners — while the bailout concentrated upward — banks, executives, asset holders.

The reforms that followed (Dodd-Frank 2010) addressed some specific abuses but left the fundamental architecture intact. Banks are now larger and more concentrated. The same too-big-to-fail dynamic exists. The next crisis will be different in detail and identical in structure.