This is one of the very best books on pricing. If you are looking to understand the economics of the world around you, you can do no better than to start here

Why Popcorn Costs So Much at the Movies, And Other Pricing Puzzles unravels the pricing mysteries we encounter every day.
Have you ever wondered why all movies, whether blockbusters or duds, have the same ticket prices?
Why sometimes there are free lunches?
Why so many prices end with "9"?
Why ink cartridges can cost as much as printers?
Why merchants offer sales, coupons, and rebates?
Why long lines are good for shoppers?