The Harry Potter series by far (I know it's not a specific book but.. whatev ), but another series I've really gotten into (halfway through) is called Rifters by Peter Watts. If anyone likes hard sci-fi he has his books for free online in a bunch of different formats.
Another one that I'm reading that's fairly appropriate is called Overdressed, the high price of cheap fashion. It talks about the fashion/textile industry and how it's come to us being able to buy a 5$ tshirt. Very interesting.