Money is quite simple - it is the accumulation of value of individual work. The same way batteries store electricity - money store value of work. The same way batteries exchange stored electricity to perform work, money is exchanging stored value to work of others that we desire.
Depends on the kind of a book. Novels, easy read - definitely better in e-form. Anything complex - textbook, or science popularization or even rich fiction - makes me miss real print. Mainly due to the lack of easy navigation. It is a lot easier to go back and re-read fragments in the real book than it is in the e-book.
TL;DR; Working with the book is easy in printed form and pain in e-format.