Nouriel's twelve steps:
Step one is the worst housing recession in US history. House prices will, he says, fall by 20 to 30 per cent from their peak, which would wipe out between $4,000bn and $6,000bn in household wealth. Ten million households will end up with negative equity and so with a huge incentive to put the house keys in the post and depart for greener fields. Many more home-builders will be bankrupted.
Step two would be further losses, beyond the $250bn-$300bn now estimated, for subprime mortgages. About 60 per cent of all mortgage origination between 2005 and 2007 had "reckless or toxic features", argues Prof Roubini. Goldman Sachs estimates mortgage losses at $400bn. But if home prices fell by more than 20 per cent, losses would be bigger. That would further impair the banks' ability to offer credit.
Step three would be big losses on unsecured consumer debt: credit cards, auto loans, student loans and so forth. The "credit crunch" would then spread from mortgages to a wide range of consumer credit.
Step four would be the downgrading of the monoline insurers, which do not deserve the AAA rating on which their business depends. A further $150bn writedown of asset-backed securities would then ensue.
Step five would be the meltdown of the commercial property market, while step six would be bankruptcy of a large regional or national bank.
Step seven would be big losses on reckless leveraged buy-outs. Hundreds of billions of dollars of such loans are now stuck on the balance sheets of financial institutions.
Step eight would be a wave of corporate defaults. On average, US companies are in decent shape, but a "fat tail" of companies has low profitability and heavy debt. Such defaults would spread losses in "credit default swaps", which insure such debt. The losses could be $250bn. Some insurers might go bankrupt.
Step nine would be a meltdown in the "shadow financial system". Dealing with the distress of hedge funds, special investment vehicles and so forth will be made more difficult by the fact that they have no direct access to lending from central banks.
Step 10 would be a further collapse in stock prices. Failures of hedge funds, margin calls and shorting could lead to cascading falls in prices.
Step 11 would be a drying-up of liquidity in a range of financial markets, including interbank and money markets. Behind this would be a jump in concerns about solvency.
Step 12 would be "a vicious circle of losses, capital reduction, credit contraction, forced liquidation and fire sales of assets at below fundamental prices".
