The banks hope the creation of the Master Liquidity Enhancement Conduit or M-LEC, will prevent turmoil in mortgage-backed securities from further spilling into other parts of the credit market. Not controlling the spillover could force a fire sale of distressed assets, making borrowers more reluctant to lend. The result: Higher interest rates and slower economic growth.
The jury is out on whether M-LEC will be successful, especially over the long haul.
Some analysts argue it simply delays the inevitable, as banks will eventually have to mark down the value of securities backed by subprime mortgages now in default.
"They're just trying to buy time," said Christopher Whalen, managing director of Institutional Risk Analytics, a consulting firm.
Others, though, say M-LEC is a crucial step in restoring calm to a market near chaos.
In just the past few months, leading banks and investment houses, such as Citigroup and Merrill Lynch & Co. Inc., have already reduced the value of asset-backed securities on their books by approximately $30 billion, said Brian Bethune, US economist at Global Insight, a consulting firm. More writedowns are coming but "it's just not appropriate to have it all in two months," he added.
At the same time, M-LEC gives the market some time to assess the extent of the problem in asset-backed securities.
No one is quite sure how many of the securities are in trouble.
Part of the reason is because about $400 billion of the securities are held by banks in off-balance sheet funds, known as structured investment vehicles.
The SIVs sell short-term debt to investors and use the proceeds to buy longer-term, asset-backed securities, which earn higher yields.
As investors became aware of the problems in mortgage-backed securities, they began to steer clear of short-term debt sold by SIVs.
M-LEC will purchase securities held by the SIVs that aren't in trouble, strengthening balance sheets of the SIVs and restoring confidence in the market so that investors will be willing to buy short-term debt from them.
Critics of the plan though say all that's happening is postponing the re-pricing of the most troubled assets, which could prolong problems in the credit market.
"Liquidity crises last longer if there's something truly wrong with the collateral that needs to be worked out," said Joseph Mason, a finance professor at Drexel University.
The banks' plan "will continue to prevent" accurate accounting of the losses, he added.
Accounting regulators have yet to weigh in on the proposal, which was the result of brainstorming sponsored in recent weeks by Treasury Secretary Henry Paulson.