It's likely that JK Rowling plans to kill off Harry Potter in Book 7 (title still unknown):
Harry, others may die in the end, J.K. Rowling saysThat will drive tens of millions of people in developed countries into deep depression. They won't buy anything, won't work nearly as hard, and the shock to the demand side will cause the global economic system to go unstable.
Author J.K. Rowling said two characters will die in the last installment of her boy wizard series, and hinted Harry Potter may not survive, either.
"I have never been tempted to kill him off before the final because I've always planned seven books, and I want to finish seven books," Rowling said Monday on London TV.
"I can completely understand, however, the mentality of an author who thinks, 'Well, I'm gonna kill them off because that means there can be no non-author-written sequels. So it will end with me, and after I'm dead and gone they won't be able to bring back the character.' "
Rowling declined to commit herself about Harry, saying she doesn't want to receive hate mail.
I've seen this effect in person with my nine (almost ten) year old daughter. In the very excellent Bartimaeus trilogy, a beloved character dies in the last paragraph. My daughter was significantly depressed for a long time. She kept reading the last chapter over and over again hoping it would turn out different.
The problem with Harry Potter is that ten to twenty million people will read it during the 72 hour period after it comes out. The overall depression of that large a group of people all at once will have a profound impact on the economy.