Economics in One Lesson:
http://www.hacer.org/pdf/Hazlitt00.pdfIt's a great read. It's brief. It doesn't go into a lot of technical detail but it does illustrate a central fallacy that many people, even some economists, make when thinking about economics. If you haven't read this book, I'm going to assume you're ignorant about economics until proven otherwise.
That is like saying that if you haven't read the Koran you're ignorant about god and spirituality. This is a political document first and a treatise on economics second. Let's not forget that. There are other schools of economics. Everything beyond the basics in economics is a fundamentally political statement.