The Harry Potter books have sold over 600 million copies. Of course there were a lot of people involved, but I think nowadays with digital self-publishing, it could be possible to have a book series that sells millions of copies while only requiring the labor of a handful of people.
The wealth gap between just being a millionaire and being a billionaire is so unfathomably massive.
Millionaires are believable in a single lucky lifetime, but billions? One thousand millionaires in one person?
The Harry Potter books have sold over 600 million copies. Of course there were a lot of people involved, but I think nowadays with digital self-publishing, it could be possible to have a book series that sells millions of copies while only requiring the labor of a handful of people.