One of my favourite author, Dan Pink in a TED video about his new book about what motivate people.

Most of us believe that the best way to motivate ourselves and others is with external rewards like money—the carrot-and-stick approach. That’s a mistake, Daniel H. Pink says in, Drive: The Surprising Truth About What Motivates Us, his provocative and persuasive new book. The secret to high performance and satisfaction—at work, at school, and at home—is the deeply human need to direct our own lives, to learn and create new things, and to do better by ourselves and our world.