the 95% failure rate is not exclusive to the stock market, although the forex market may have a slightly higher failure rate due to the unregulatory structure and high leverage but to get the correct answer to your question we need to ask the 5% who suceed not the 95% who fail so here's something you might find interesting.
Quote:
The Harriman family fortune, which endures to this day, was created in the early 1900s by "Old man Harriman," who had started his career as a floor runner and wen on to become a major banking and brokerage power. He made a $15 million profit in 1905 from one play in Union Pacific. This speculator king focused on just railroad stocks, the hot issue of his era.
In 1912, an interviewer asked Harriman about his stock market skills and secrets.
The trader replied, "If you want to know the secret of making money in the stock market, it is this: Kill your losses. Never let a stock run against you more than three-quarters of a point, but if it goes your way, let it run. Move your stops up behind it so that it will have room to fluctuate and move higher."
Harriman learned his cardinal rule from studying trading accounts of customers at a brokerage firm. What he discovered was that of the thousands upon thousands of trades in the public accounts, 5- and 10-point losses outnumbered 5- and 10-point gains. He said, "by fifty to one!" It has always amazed me that businesspeople who have tight control and accounting practices in their stores and offices lose all control when it comes to trading. I cannot think of a higher authority than E. H. Harriman, nor a more enduring rule of speculation than what this man gave us in 1912.
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But you might say thats a long time ago and markets change, hell we don't even use the quarter and sixteenth system anymore and markets are electronic now-a-days. But apparently this reason why 95% fail has'nt really changed in the documentary "Trader" Paul tudor Jones a contemporary trader says the very same thing. I would have given you the youtube link but it seems its been removed for copyright violation.
So the answer or part of the answer may be because they don't agressively cut their losses. Of course you need a system which works you need to follow good mm, there's psychology, discipline and all but the above is probably the most common reason