Stock prices show a random undulating pattern - tomorrows price is based upon todays price. Ideally we predict every trough and buy and every peak and sell. I buy into the wave analysis and fractal guys in that peaks and troughs occur at different scales. You can pitch your scrutiny of the graphs at whatever interval you like - weekly, monthly, yearly and follow the peaks and troughs at those scales.
I'm currently playing around with weekly and 3monthly to try and slow my trading down and make predictions on these scales. When I first started I paniced at every down turn thinking the price was going off a cliff and bought whenever the price looked to be going up. Such behaviour leads to being "out of sync" with the trend and buying at the peaks and selling at the troughs! If you make a loss just wait until the market recovers is a slow but sure way to get the value back. Continual shifting capital around looking for profit seems only for the real dedictaed and is highly risky plus expensive given about a 0.5% cost to buy and sell.

Another crutial understanding is the awareness of bubbles. They say a bubble has many stages the last of which is euphoria, "when even the shoeshine boy is giving stock tips" it's time to sell. I got hit by the gold bubble burst last time expecting the financial crisis to play out fast and logically - but it didn't and investors were remarkably slow to digesting information. What is unfolding now we knew about 18months ago yet it has only just hit the markets for real! The economy has a lot further to unravel and gold has a lot further to go, but the timescale is years not weeks!
Finally a point of interest that no-one seems to ever discuss. The price is purely the result of investor behaviour. If confidence is high: the price is high and vice-versa. When reading any technical analysis then it is worth bearing this in mind. If people will be inspired toward a stock by news, trends or technical analysis even if there is no real underlying logic then the price will rise and vice-versa. It is good to be irrational in trading. Smart in predicting the wolf but then like a sheep in prediction how the market will behave.
Now for the really smart of course we are in game-theory territory here. The movement of stock trends is really just a vast game of various competing strategies. At some time in the past certain trends have been noticed and now people follow those indicators and trends which thus makes the market behave according to the indicators and trends. So while technical analysis works it is simply because people follow technical analysis that it works - a self fulfilling prophesy not a principal of the markets - something worth remembering. But of course what I say here if it affects market behaviour will simply feed back on itself untilw e have some kind of stable population of strategies out there... that is the real secret to understanding the market - the population of strategies amongst investors.
I look forward to seeing what happens here in the gold trend. A double top I believe

That all said its like Heisenberg: you say something and you change the system. A writer when asked on his next book said ' you can either talk about something or you can do it, and I want to write about it'. Decisions for tomorrow's investments are only based on sentiments today, they are not dictated by today...
-- update : interesting post from a fractal analyst
http://www.kitco.com/ind/nichols/feb272009.html
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