This small collection resumes in economic terms 50 ideas and demonstrates that they are wrong. I am disappointed because I really thought this book would help me see things differently, from a different angle. And in fact, it turns out that I personally had not accepted the ideas presented here. In other words, I knew already having taken further information than was presented do not correspond to reality, apart from two points, which, fifty is low. I am no more informed before that after reading this book. However, it certainly will match the expectations of other people since followed a first volume which had to appeal because it followed it.