A relatively small volume on the psychological concept of loss aversion. The idea that people dislike loss more than they like gain.

The author is able to thoroughly cover the topic of loss aversion, and its related concepts, in a clear manner. He then goes on to give examples of how they can be used in game design.

Highly recommended to both game designers, and people who just want to know more about the psychology behind why some games are more enjoyable than others.