The liberal approach to politics, social relations, and the economy stands out because it prioritizes free choice. The great liberal thinkers, who established and disseminated this school of thought, wanted the individual to be free when it comes to exercising the right to choose. To achieve this, liberals wanted to structure an Open Society. The emphasis of liberals on the freedom of individuals, ideas, activities, and choices, with tolerance and priority on progress, new ideas, and perceptions, creates numerous fields of conflict with other philosophical and political approaches. This introduction to the principles of liberalism presents the basic principles and ideas: tolerance, self-ownership, rule of law, and rights, as they have decisively influenced modern constitutional democracies. But what is the relationship between liberal ideas and the free market and capitalism? How does it relate to the critique of economic liberalism?