" Certain people make a living from their abilities, such as pilots, plumbers, and lawyers. In other areas, skill is necessary but not critical, as with entrepreneurs and leaders. Finally, chance is the deciding factor in a number of fields, such as in financial markets. Here, the illusion of skill pervades. So, give plumbers due respect and chuckle at successful financial jesters. "

― Rolf Dobelli , The Art of Thinking Clearly