In Economics, the analysis of the big aggregate numbers of a country belongs to the area of Macroeconomics. Its language tends to be cumbersome for non-economists, raising a barrier that makes difficult the task of getting through the interesting messages that macroeconomic analysis can deliver. The motivation of this book is to help to overcome such a barrier, trying to present in a brief and schematic straight way some of the keys that allow thinking about the macroeconomic performance of countries. The book builds on the simple idea that some of most basic questions you need to ask and answer in order to assess economic performance are the same no matter whether you are looking at a household, a company or a country.