“共交易3000-5000万股，而利润很是微薄，大约20%”
我的理解加假设：Assume the stocks that you have traded have an average price of $10/sh, then your transaction in dollar amount is $300~500M. Your profit margin is 20%, therefore your profit is $60~100M.
不对吗？
$10/share 很保守啊。一年 $60~100M 毛利也很牛啊。
