FORMER FEDERAL RESERVE CHAIRMAN ALAN GREENSPAN SAYS HE KNEW ABOUT ABUSES IN SUBPRIME LENDING BUT FAILED TO FORSEE THEIR PARALYZING MARKET EFFECTS UNTIL LATE 2005 ? "60 MINUTES" SUNDAY

He Defends His Lower Interest Rates that Critics Say Caused the Subprime Meltdown and Praises Chairman Ben Bernanke for His Handling of the Current Market Turmoil

Former Federal Reserve Chairman Alan Greenspan admits he "didn't really get it" that the subprime lending trend was significant enough to hurt the economy until very late 2005, but still defends his lowering of interest rates from 2001 until 2004 that critics say caused the crisis in the first place. Greenspan, who led the U.S. Federal Reserve Bank through 18 years and four presidents, speaks to Lesley Stahl in his first major interview, to be broadcast on 60 MINUTES Sunday, Sept. 16 (7:00-8:00 PM, ET/PT) on the CBS Television Network.

Greenspan says he knew about the questionable subprime lending tactics that gave loans to homebuyers and investors with low adjustable interest rates that could rise precipitously, but not the severe economic consequences they posed. "While I was aware a lot of these practices were going on, I had no notion of how significant they had become until very late," he tells Stahl. "I really didn't get it until very late in 2005 and 2006."

Even though one of the Federal Reserve governors raised a red flag on those lending practices, Greenspan says there was little he could do. "Well, it was nothing to look into particularly because we knew there was a number of such practices going on, but it's very difficult for banking regulators to deal with that," says Greenspan.

Several of Greenspan's former Federal Reserve governors have since said that Greenspan's policy of lowering interest rates for three consecutive years early in the decade was wrong because it opened the door for the subprime lenders. They think he kept rates too low for too long. "They are mistaken," Greenspan tells Stahl. "It was our job to unfreeze the American banking system if we wanted the economy to function. This required that we keep rates modestly low," he says.

Some believe today's market slide - U.S. stocks have lost significant ground over the past few months - could have been slowed had the current Federal Reserve Chairman Ben Bernanke lowered interest rates like Greenspan did early in the decade. Would he act as dramatically and quickly now as he did then if he were the current chairman as some believe? "I'm not sure that's true," says Greenspan. "We were dealing in an environment back there where inflation was easing. We could have acted without the fear of stoking inflationary pressures. You can't do that anymore....I'm not certain I would have done anything different [if he was the chairman today]," he tells Stahl. "I think [Bernanke] is doing an excellent job."