Comments on it from my blog: Apples and oranges aside and suspending disbelief in things that go bump in the night... Comparing Market sentiment with many phenomenon connected with life in this universe might give one an idea of sync, an idea that similars want to agree... In gauging market behavior to trivialize this, You may notice a striving of the participants to group up and try to agree. This could lead to irrational exuberance, overbuying and overselling, before the urge to conform to the prevailing trend is broken. http://radio.weblogs.com/0133588/2004/05/30.html#a30