It is one of the best books to study Macroeconomics.

This is one of the best textbooks I've had the pleasure of reading. The thing that makes this book good is that the author does not fill the pages with meaningless jargon and unnecessary filler. He often dives right into the topic or sets it up by telling a short story that is relevant to the topic. Any kind of math in the topics are written in an easy to understand step by step process. He also provides graphs on many of these topics so you can clearly see what he is talking about, these graphs are accompanied with a short summary containing the important concepts.