Quote from jsmooth:
markets usually turn (or make drastic moves) when as many people as possible are not expecting it and they're not positioned to profit from it (or they're on the wrong side).
Once all the contrarian guys get out because they've been wrong and beaten up numerous times is when the move (they original where trying to capture) finally happens - without them, and they're on the sidelines scratching their head wondering wtf just happened.
It happens that way because a situation like that creates a massive order imbalance and panic....then everyone is running for the exits at once.
True contrarians don't play a contrarian move just because it went against the "tide". They make moves when the market tells them greed or fear is being obsessed by the general population. In other words, you don't short in a bull market just because it's up. You short when there is no good fundamental reason why it should be up (as evidenced in July of last year when the market surged and there was much proof that the subprime crisis was going to greatly devalue many companies)
And in a "bear" market, a contrarian makes a move when really bad news comes out and the market overreacts. IMO, it's much easier to buy bad news then to sell good news. Fear is a more powerful device than greed. Fear causes people to become ultra-conservative and contagion causes everybody to latch on. Greed is less powerful to fade because by our very nature, humans are always (or most of the time) watching out for the predators. So, we "inch" our way up the greed ladder until we realize that we have stepped on broken rung. But, the path up that ladder is a slow and tedious process. You don't short until that broken rung has been reached. On the other hand, after realizing that the ladder is defective, people will get off that ladder faster than they can logically address the real danger. Thus, that one broken rung will cause an overreaction. And then the "slow" climb back up the ladder starts again from the overreaction.
Humans are animals after all. We are much more afraid of being killed by prey than we are greedy about going after out prey. We would never venture out to get food if we knew that a predator was directly there. If we thought the predator was gone, we would slowly and attentively move out after our food. We would be overly conservative and wait longer than we need to. The overreaction that fear breeds.
But, this is where I think fundmamentals trump techincal indicators. Fundamentals can tell you much more precisely if we are overvalued or undervalued. If we've overreacted or we've reached the broken rung. I personally would never play a contrarian move strictly off technicals. I would make sure that my own research on the fundamentals validates my opinion.