English author Adam Fletcher founded two start-ups. With one he earned 3000 euros a month, without doing anything. For the other he worked - and made loss. Here he explains what he has learned from it. The only subject I had been good at at school was economics, so I studied that. In high school, college, and university, I often heard that I was a natural in this subject, and that was me Clear that one day I would start my own business. But despite the many years of teaching, I never had the feeling that my knowledge of how companies actually functioned exceeded the level of a ten-year-old. The great thing about the digital revolution: It's possible to build companies where we only do one job once, but are paid several times, passively, without us having to be there. Passive income. Once you've experienced that, it's like having a little light bulb on; the darkness disappears and you shout, "That's the way it must be!" I got to know the diff...