The Cheerleaders in DenialThere was no limit to the rosy economic predictions made by prominent people, right up until those predictions blew up in their faces.Alan GreenspanThe Federal Reserve's former chairman dismissed the idea of a nationwide housing bubble as "most unlikely" while further fueling home sales with low interest rates. In 2004, he even encouraged home buyers to pursue risky adjustable rate mortgages against the advice of other experts. And he opposed attempts to regulate the ex