just remember this: when you -50%, you need +100% to make it back to where you came from, and it's almost impossible given that if you cannot make positive investment.

This maths is hard coded to make people lose in investment especially without first understanding risk of ruin.

If you don't know this, you will probably tinkle with martingale and end up ruining your portfolio.

x% traders will lose x% of their portfolio in x days. You tell me what is x=?