This book makes economic concepts more accessible to all those who want to understand the ?logic? behind economics, and tries to go a step further in explaining economic analysis and its usefulness.To do so, it begins by analysing the economy the smallest and most detailed perspective, Microeconomics. Once the criteria for the individual economic decisions have been defined, it will move on to analyse how the economic activities of a country are measured and its main economic problems at an aggregate level, i.e. Macroeconomics and afterwards, it gives greater dimension to the analysis, moving the macroeconomic analysis of a country to an analysis of the International Economy.In short, in order to reach our final analysis and understand international economic relations, we must first understand how economic decisions are made at an individual level, as it is the sum of individual decisions that shape the global economic structure.