CSS Analytics tiene un post (y promete un segundo) sobre las limitaciones del análisis técnico. Sirve leerlo aunque sea solo para confirmar creencias.
First, let me state a unique premise: without other market players believing in fundamental analysis, I believe that technical analysis would not work. Huh? Well the truth is, all major trends including both bull and bear markets are a function of the belief in some theory about fundamentals. Few individuals with serious wealth are willing to risk their own money on the basis of an interpretation of a chart pattern. Imagine telling a client that has given you $25 million to invest that you are going to be investing $5 million in China Telecom because “the chart looks good.” Or how about trying to tell that same person that you are going to increase your exposure to Citigroup in 2008 “because my indicators show that the stock has hit a bottom.” You better have a good reason to explain to this same person why you are risking their hard-earned money on a bunch of chart squiggles. For this reason, most of the money in the mutual fund and pension fund universe is invested using fundamental research and macro-economic theses about a specific stock, sector or commodity. Typical examples include statements such as: “the world is running out of oil”, or that “the internet is going to take over brick and mortar business.”
Not some, but nearly ALL major bubbles or parabolic moves are created by feedback loops that start with a few people believing in a given theory and end with the majority achieving a consensus that a theory is true.