The tumult in the financial markets has led businesses to revisit their interpretation of the housing boom earlier this decade and the easy credit that fueled it says Carl Tannenbaum, president of NABE and the chief economist at LaSalle Bank/ABN Amro. 29% of the surveyed members called it a "serious national bubble" more than doubled from two years. The risk is however considered short term as the NABE members still expect home values to appreciate in the next five years rather than fall.