21.   It will take some irrational exuberance.

22.   Just as irrational exuberance can look like wisdom during a sustained stock boom, irrational pessimism can look like wisdom during a sustained stock slump.

23.   Like Federal Reserve Chairman Alan Greenspan warning against irrational exuberance in the stock market, meteorologists could be heard reining in intemperate spring fever.

24.   Look to the long future for optimism, Greenspan said in language seemingly crafted to ward off irrational exuberance.

25.   No longer does Alan Greenspan, chairman of the Federal Reserve, warn of irrational exuberance.

26.   Pessimism and doubt have trumped irrational exuberance.

27.   So valuations that look very high by historical standards might represent not the rise of irrational exuberance but the decline of irrational pessimism.

28.   Stock traders are not the only ones prone to irrational exuberance.

29.   The extraordinary bull market in shares has diverted attention from the traditional indicator of irrational exuberance, a booming housing market.

30.   The expectations of coming misery casting a shadow over discretionary spending are the flip side of irrational exuberance.