The Rational Trading Group

You need people to see at a glance why leverage doesn’t make losses grow linearly. It bends the curve.” Pei Yanzhou stared at the sketch and said nothing for a long time. Ruan Qingdai added, “You didn’t just fail once. You stepped into the hole for a lot of people. So don’t stop at emotion. Turn it into a tool.” So they started building something simple. No flashy interface. Just a few basic input fields: principal, leverage, entry price, stop-loss, funding rate, and reserved margin. With one click, it would show liquidation probability, drawdown space, and the most dangerous add-on paths under different volatility assumptions. Ruan handled the logic and visualization.