The economy is a social science that studies the production, the distribution and the consumption of goods and services. It analyses how the individuals take decisions, how they interact and how institutions and incentives influence their behaviour. The aim of this matter is to set the bases of a rigorous language and transmit the basic economic knowledges so that the student learn to think like an economist. The program of the matter offers a panoramic view of the great ideas that are repeated in economics such as opportunity cost, decision making in marginal terms, the role of incentives, the efficiency of market allocations, and so on, up to ten basic principles that form the foundation of economic analysis.