By Ambrose Evans-Pritchard, International Business Editor
The verdict is in. The Fed's emergency rate cuts in January have failed to halt the downward spiral towards a full-blown debt deflation. Much more drastic action will be needed.   
The Federal Reserve building in Washington
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Yields on two-year US Treasuries plummeted to 1.63pc on Friday in a flight to safety, foretelling financial winter.
The debt markets are freezing ever deeper, a full eight months into the crunch. Contagion is spreading into the safest pockets of the US credit universe.
It is hard to imagine a more plain-vanilla outfit than the Port Authority of New York and New Jersey, which manages bridges, bus terminals, and airports.
The authority is a public body, backed by the two states. Yet it had to pay 20pc rates in February after the near closure of the $330bn (£166m) "term-auction" market. It had originally expected to pay 4.3pc, but that was aeons ago in financial time.
"I never thought I would see anything like this in my life," said James Steele, an HSBC economist in New York.
No sane mortal needs to know what term-auction means, except that it too became a tool of the US credit alchemists. Banks briefly used the market as laboratory for conjuring long-term loans at Alan Greenspan's giveaway short-term rates. It has come unstuck. Next in line is the $45trillion derivatives market for credit default swaps (CDS).
Last week, the spreads on high-yield US bonds vaulted to 718 basis points. The iTraxx Crossover index measuring corporate default risk in Europe smashed the 600 barrier. We are now far beyond the August spike.
Sub-prime debt is plumbing new depths. A-rated securities issued in early 2007 fell to a record 12.72pc of face value on Friday. The BBB tier fetched 10.42pc. The "toxic" tranches are worthless.
Why won't it end? Because US house prices are in free fall. The Case-Shiller index for the 20 biggest cities dropped 9.1pc year-on-year in December. The annualised rate of fall was 18pc in the fourth quarter, and gathering speed.
As the graph shows below, US households are only halfway through the tsunami of rate resets - 300 basis points upwards - on teaser loans.
The UK hedge fund Peloton Partners misjudged this fresh leg of the crunch. After an 87pc profit last year betting against sub-prime, it switched sides to play the rebound. Last week it had to liquidate a $2bn fund.
Like many, Peloton thought Fed rate cuts from 5.25pc to 3pc (with more to come) would end the panic. But this is not a normal downturn, subject to normal recovery. Leverage is too extreme. Bank capital is too eroded. Monetary traction eludes the Fed. An "Austrian" purge is under way.
UBS says the cost of the credit debacle will reach $600bn. "Leveraged risk is a cancer in this market."
Try $1trillion, says New York professor Nouriel Roubin. Contagion is moving up the ladder to prime mortgages, commercial property, home equity loans, car loans, credit cards and student loans. We have not even begun Wave Two: the British, Club Med, East European, and Antipodean house busts.
As the once unthinkable unfolds, the leaders of global finance dither. The Europeans are frozen in the headlights: trembling before a false inflation; cowed by an atavistic Bundesbank; waiting passively for the Atlantic storm to hit
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