Because it is a guide to make your way for being a successful entrepreneur.Successful entrepreneur started in learning then after that is applying then success will come.Without proper knowledge how can you survive and understand the world of business.
Yes you are right, if we don't have knowledge what happened to our life it become miserable cause you don't know how face in trials in business woeld. That's why we need to study and learn the Economics cause if you learn about this subject you know how to handle a business and to become successful cause you understand and you can apply it.