Question: What is a good intro book for the layperson on economics?

Response: I highly recommend Economics in One Lesson, by Henry Hazlitt. It is affordable, not very long, and very easy to read. Once you have read Hazlitt, I recommend reading anything you can find by Frederic Bastiat. He's also very easy to read.

If you're interested in digging into bigger books (but still focused perfect for the layman), I suggest Basic Economics, by Thomas Sowell. Sowell has also written Applied Economics, and The Housing Boom and Bust. They're both excellent.

All of these books will provide you with a very solid foundation.

There's tons more good stuff out there, of course, but these will be enough to start with. ;)