Why does technical analysis work?

Technical analysis describes different ways of predicting the future of the stock/futures market based on its history.

Unfortunately, technical analysis is not an exact science. Many prominent scientists label it as "voodoo science". They claim that due to market efficiency, if you use TA to find your entry positions, you’re no better off than someone who chooses those positions randomly. Market efficiency means that all the available information is already calculated in the stock prices, and that you can only guess how the price will behave in the future.

The "voodoo science" theory would make sense if it wasn’t for the fact that there is a significant number of traders who are able to consistently make profits in the stock/futures market. These traders use technical analysis as their main tool. Since any trader has or can have access to the same TA tools we have to ask how can a small group of traders consistently win and the other larger group, more or less consistently lose in the stock market game. What is it that winning traders know about technical analysis that gives them the upper hand?
The answer is simple: Technical Analysis works but not necessarily for the reason most people believe. Many successful traders don’t want to share this secret. TA works because many people use it, and successful traders are able to predict how other people will react on the different TA indicators and signals. In other words, while the losing traders are using TA to determine their trades, the winning traders are winning because they know how the losers are going to react based on this data. For example, when a price goes below one of the key moving averages, (MA’s) many investors sell that instrument to protect themselves against additional losses. By doing so, they will drive the price of that instrument lower and that will prompt some traders to start short selling that instrument in anticipation of further decline.

Prices continue the downward trend, forcing traders who were long on that stock to sell their positions because it is going below their stop limits. This creates a domino effect as the price continues to decline. However, at this point, successful traders realize that most of the current price action was created artificially. They start to enter positions on the buy side and more often than not price starts to reverse. The losing traders have already sold their contracts based on the TA tools. The winning traders buy the contract because they understand that the fluctuation was temporary, and they seize the opportunity based on the losing trader’s reactions.
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