Abstract
Services constitute a great share of GDP in the MENA countries and influence the economic growth of these countries. Indeed, a 1% increase in the added value of the services sector enhances a 0.49% rise of the economic growth and 62% of the growth variation depends of tertiary sector. Moreover, the recent opening of these countries at international trade does impact the added value of the services sector. Thus, in the long run elasticity between added value and trade openness is strongly positive while in the short run it is mostly negative and exhibits a higher or lower value depending on country.