“Today’s gain is approximately seven percent”, I summed up. It was three years ago on a Friday evening, when NYSE and NASDAQ were closed until Monday. Browsing through the business world’s news, I jotted down patiently all risky stocks with big potential payoffs, and worked out a trading strategy for the next week. The deep night, eyes tired of reading the screen, I turned off the laptop and opened the window. In the fresh air, I took a...