What's the best book on pricing you've ever read?

What's the best book you've ever read on pricing?

1. "Predictably Irrational" by Dan Ariely. Goes into depth about the many ways in which humans make irrational decisions.
2. "Don't just roll the dice" by Neil Davidson. Shorter free-of-charge eBook which has more actionable, hands-on pricing information.

Another good one is Pricing for Profit: How to Command Higher Prices for Your Products and Services.

Also check out the free ebook Jesper linked to, Don't Just Roll The Dice. It's a really quick read, it has good information, and it's free. I think everyone should at least start with that one.