There has never been a weekend like it in my 25 years as a financial journalist.
For Wall Street, it has probably been the most extraordinary 24 hours since the late 1920s.
As I said would happen yesterday evening, Lehman has announced that it is filing for bankruptcy protection under Chapter 11.
To prevent contagion to the next most vulnerable investment bank, mighty Bank of America is buying Merrill Lynch for about $50bn.
That Merrill is steering itself into safe harbour, no longer confident of its future as an independent, is almost as shocking as Lehman's demise.
And one of the world's biggest insurers, AIG, is reeling from losses on its exposure to real estate and credit default swaps, or complicated financial insurance - and, according to the New York Times, is seeking a $40bn bridging loan from the Fed.
As for the US central banking system, the Fed, it is endeavouring to minimise the damage to the financial system from these shocks by allowing securities firms to swap shares for short-term loans, to tide them over.
The Fed is also increasing by $25bn the amount it is prepared to lend to bond dealers.
And a group of 10 banks, including Citigroup, JP Morgan and Goldman Sachs, have created a $70bn collaborative fund, to try to prevent market liquidity from evaporating in the coming anxious hours.
The global financial economy has never in recent years been tested by quite such a combination of accidents and jolts to confidence.
In a way it's fortunate that most Asian markets have been shut today. But the dollar has inevitably fallen in what little trading there's been, Australian stocks have fallen, and futures prices are pointing to a very weak opening on Wall Street.
For most investors and bankers anywhere in the world, today will be a day to endure and survive.
Probably the most positive development in the past 24 hours is that 10 of the biggest US banks are pooling their cash in a collaborative effort to prevent any of them running out of funds in an emergency.
Each of them is contributing $7bn and each can borrow up to $23bn from the common pool.
The members of this liquidity consortium include our own Barclays, along with Citigroup, Goldman Sachs, JP Morgan, UBS and others exposed to the fallout from the collapse of Lehman.
The initiative represents an outbreak of common sense among the banks - because in this time of chronic market dislocation, it's a way of ensuring that cash gets to where it's most needed.
The crisis in the global financial economy doesn't stem from their being too little cash in aggregate. It's simply that much of it isn't where it's most needed.
A useful analogy would be Eric Morecombe's protest to Andre Previn in the classic sketch that he was playing all the right notes of Grieg's Piano Concerto, but not necessarily in the right order.
It wouldn't do any harm for the US cash cooperative to be replicated over here by our banks.
There's a time for cut throat competition between banks, and this probably isn't it.