Abstract
Free trade is an economic doctrine which commends free traffic of goods and services between different countries. This theory applies to international levels. The liberal principle according to which we admit we let the market act itself (i.e. we eliminate obstacles and foreign interventions, as well as quotas fixation or customs duties) in order to lead to best possible economic situation.
The world's economy structure and strategies have evolved a lot since 1950's. A strong tendency of acceleration of international exchanges has been developing since the end of the 20th century with the recourse of the free trade, the doctrine which encourages the free traffic of people, capital and goods in the form of free trade areas (example: the European Union).
Of course, each country keeps its own autonomy to take decisions concerning custom taxes for the non-members countries of the euro zone. However, if we want to verify the efficiency of free trade it is necessary to measure its effects on economic growth, in other terms, the increase of the Gross Domestic Product during a long period of time.
