One of the things I have consistently pointed out was that the so-called Housing Bubble was in reality two bubbles: Credit and Interest Rate.We can define a bubble as a “trade in high volumes at prices that are considerably at variance from intrinsic values." By that definition, I'm not so sure Housing was a true bubble -- the run up in prices, a doubling over the course of about 7 years, was actually a rational market response to interest rates being dropped to generational (46 year) lows. Trading volumes moved up, but proportionately so. Compare that with the Nasdaq, which doubled from October 1999 to March 2000 on a dynamic of a new paradigm. Trading volumes skyrocketed. When it was over, the Nazz had plummeted 78%.