The main objective is students to become familiar with the mathematical tools that are used to make decisions in the field of economics and finance. According to Morgens Niss, formerly responsible for the PISA results: "Democracy is not a big deal if citizens are illiterate in mathematics. Politics is not about words, but about numbers and, in the end, it can only be judged by numbers. The citizen who does not understand public budgets will have to believe what politicians wanted to tell them”. This is why we will carry out activities in which students will have to use mathematical concepts to decide on investment strategies following the EURO STOXX index, so these students can become competent European citizens.