It's been over a year since I last posted on liar loans -- these are mortgages which the borrower obtains despite offering no documentation on their income, employment or assets. These liar loans were also known as Ninja loans -- which is short for no income, no job, and no assets. The Associated Press reports that such liar loans will add $100 billion to the losses our economy is already suffering thanks to $400 billion worth of losses from subprime mortgages.

The problem we face as an economy is that it's hard to see where the liar loans end and the collateralized debt obligations (CDOs) and other asset-backed securities begin. In a sense, they are all liar loans. In the case of the mortgages, borrowers created paperwork that was inconsistent with their actual financial condition so they could get the money. In the case of CDOs, the issuing investment bank bought a AAA rating from a rating agency which created the illusion that the security was safe. Conceptually, there is little difference -- both depended on essentially forged paperwork to make the loan go through.

Why did banks issue liar loans? They were afraid to lose market share. But that doesn't make it right. As my mother used to say to me, if the other kids jumped off the Empire State Building, would you do it too? AP brings this to life in an interview with David Zugheri, co-founder of Texas-based lender First Houston Mortgage who said, "Everybody drank the Kool-Aid. They knew if they didn't give the borrower the loan they wanted, the borrower could go down the street and get that loan somewhere else.''

After the recent pounding that the subprime mortgage sector has been taking, you're probably not thinking about its investment opportunities. But that's what I'll be talking about on CNBC at 11 a.m. with Becky Quick and Tom Gardner of Motley Fool.

There are two reasons for thinking there might be opportunities here:

• Investment banking put - Investment banks are putting a floor under the stock price of many subprime lenders. For example, Goldman Sachs Group Inc. (NYSE: GS), Lehman Brothers Holdings, Inc. (NYSE: LEH) and Bear Stearns Companies, Inc. (NYSE: BSC) have all said they may commit more funds to subprime. Yesterday, Accredited Home Lenders Holding Co. (NYSE: LEND) added $3.39, or 56%, to $9.43, helped by apparent takeover speculation in the wake of its statement Tuesday that it would explore "strategic options." On the pink sheets, New Century Financial rose 68 cents to $1.35, more than doubling its share price from a day earlier. NovaStar Financial Inc. (NYSE: NFI) is also up 50% since it bottomed out at $3.43 on Tuesday.
• Picking the long term survivors - Not every industry participant will be wiped out. For example, Countrywide Financial Corp. (NYSE: CFC) -- which only has 7% of its loans in subprime -- added $376 million in cash for a total of $1.4 billion in 2006. Nevertheless, it is far from being out of the woods: it recently reported a rise in bad loans across the board -- i.e., payments were 30 days late at the end of 2006 on 2.9% of prime home-equity loans serviced by CFC, up from 1.6% a year earlier and payments were late on 19% of subprime mortgage loans [subscription required], up from 15.2% at the end of 2005. If it reports worse than expected damage in future quarters, CFC will drop further, which could represent buying opportunities that lower an investor's cost basis. Despite the medium term pain of such a strategy, if CFC survives until the next housing upturn, investors will profit.