If you've read the blog already, I think you're missing the point. The number is not only irrelevant, but it's not an indication of the competition. The article explains this. It's more about why this number is as high as it is (irrespective of facts) and what it means to you.
At the end of the day, it is impossible to prove. What's more important is this misconception of this number and why so many view it as a benchmark.
If you understand why so many retail traders are failing, then 'you' can do something about it...
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Leverage creates additional risk and loss exposure. Before you decide to trade foreign exchange, carefully consider your investment objectives, experience level, and risk tolerance.
You could lose some or all of your initial investment. Do not invest money that you cannot afford to lose. Educate yourself on the risks associated with foreign exchange trading, and seek advice from an independent financial or tax advisor if you have any questions.
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Past performance is not indicative of future results.