How to Speak Money is a list of financial term that are explained to us in details to us, the reader. What makes this interesting is that John Lancaster describes it to us sarcastically, which makes this a really funny book
I thought I knew all the terms defined in this book, but Lanchester has a very different view of the matter, and I learned a lot about economics. He's very good at giving a concrete explanation of what seems abstract.
Do not use this book as an actual reference, but rather as a gift for a friend who has finance background.