Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is it true that 90% of investors lose their money?
Fail? What is the standard? If you include the base case of keeping your money under a mattress, then you only have to earn a $1 over your lifetime of investing to not fail. What about making more by investing when compared to keeping money in a checking or savings account? How could 90% of investors fail to achieve these standards? Update: with the hint from the OP to google "90% investors lose their money" it is clear that "experts" on complex trading systems are claiming that the 90% of the people that try similar systems, fail to make money. Therefore try their system, for a fee. The statements are being made by people who have what should be an obvious bias.