Even Though Everyone Seems To Know About It, from Phil McDonnell
It is rather interesting that the ubiquitous 200 day moving average (actually 40 week ma) still works at all, because everyone seems to know about it.
Larry Williams replies:
Technical indicators, I think, can be widely known about and still 'work' because of the frailty of humans; as a group we have problems with following/sticking to rules. We can all know we should not drink and drive, speed, do drugs, smoke, etc… but most violate basic rules.