I'll tell you about Harry Potter more precisely about the commercial aspect.
My problematic is how a hero created by an unknown author became an international success and a brand for all sort of derivatives?

D Outline

D I choose this subject because of the 7th film which will be in theaters next week.
It a way to comeback on the social phenomenon. I'm not a Harry Potter's fan, I just read the books and saw the films. I don't know if there is here fan, …
I will present you very quickly this young hero, because I think everyone know him. We grow up with this story.

“Harry Potter is a series of seven fantasy novels written by the British author J. K. Rowling. The books chronicle the adventures of the adolescent wizard Harry Potter and his best friends Ron Weasley and Hermione Granger, all of whom are students at Hogwarts School of Witchcraft and Wizardry.”
Since the June 30, 1997 release of the first novel Harry Potter and the Philosopher's Stone, the books have gained immense popularity, critical acclaim and commercial success worldwide
This story change the life of the author JK Rowling whose start with nothing and have now a fortune estimated at $1 billion.

DI The Books more than 400 million copies worldwide /10 years/ 67 languages
Each book cost in the 15€-> we can calculate yield €6 billion
I can't give you the real sales of those books because it increase everyday. So I will just give you the sales of the first day. 4 Record Broke Harry Potter and the Philosopher's Stone | | Harry Potter and the Chamber of Secrets | | Harry Potter and the Prisoner of Azkaban | | Harry Potter and the Goblet of Fire | 3 million copies were sold over the first weekend in the US alone | Harry Potter and the Order of the Phoenix | 5 million | Harry Potter and the Half-Blood Prince | 9 million | Harry Potter and the Deathly Hallows | 15 million |
Shop ->different editions