What is the mother hen rule, only earning and never losing? Your principal is the mother hen. When it doubles and you’ve made a profit, you sell, and you will never lose. After making money, invest in another coin and repeat the process; you’ll only make profits. If you’re not making money, don’t sell, and you won’t lose. Price fluctuations are normal. As long as you buy coins at their lows, you will always make a profit.