It’s very easy to tell if it works. If you go to an interview with Goldman Sachs and mention that you are an expert in TA what would be their reaction?
This is not an endorsement of TA but look at what they do, not say. They are highly influneced by chart movements. Price predictions and buy/sell recommendations are constrained by recent trends and observed prices. Even if they want to say they are driven by fundamentals. These “fundamentals” change in reaction to price action.
>This is not an endorsement of TA but look at what they do, not say.
What they do is make-market, rather than conduct proprietary trades, and spend huge amounts of time, money and effort on risk management that's based on hedging the risk in the book rather than forming an idea about which way the market is going to move.
Yes. If you value a stock based on fundamentals, including estimates of the company's future performance, at $10 and the current asking price is $100 you don't want to buy it. Vice versa, you would.