Some intresting replies guess people have time to think weekends
To make any sense of the question It would help to define what "TA" is and what does "works" mean. Is quantative analysis a sub set of TA for example? Surfer mentions order flow, is the analysis of orders and order book TA? Is a plain price chart TA, it is only a sampled representation of historical price after all.
"Works" is even trickier, (certainley in the absence of a defintion of TA) are we talking about using it (TA) completely mechanicaly, or as some sort of decision support tool? An aside you can use a hammer to bang in a nail does it work for that purpose? Some who have posted here would concider consistantly extracting a handful of ticks a day "working" (most probably) others would require more. Are we even talking about TA as a tool to trade or as a tool for the forcasters and other talking heads?
Heres a thought draw a random line through a chart and trade from it. It can be done profitably - just monitor price action around it. (is "price action" "TA"). Use some simple rules like buy above and moving away etc. Is a random line TA?
Kind of a semi-troll post imho, despite that some very intresting replies. Often the case. I would like to know what the OP conciders "TA" and works for what exactly?
Guess I should offer up a stab at a definition. How about :- TA is the analysis of current and past price and volume of an instrument or instruments. I guess that puts all the meat into the "works" side of the equation.
For me I use TA to know where I am now, where price is compared to where it has been before. From that point of view it clearly works. Can this be used to make a trade, yes. Can it be used to forcast the future, no. Can it help at anticipating a couple of possible future senarios and then monitoring which is playing out, yes.
Cheers,
Nick.