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The development is the dominant characteristic of the evolution of the world economy since the end of the last war. Evidently it requires an important effort of investment in order to increase the potential of production and a programming or scheduling to orient the choices and the actions. It rests on the economical growth but this growth needs all activity branches to be lasting. The question is to know if it is possible to arrive to the stage of a supportable growth from a sector among others, the tourism. Before, we need to appreciate the economic importance of this sector and to know the mechanisms by which the main social and economic variables influence its multiple activities. A real analysis of the determinants of the touristy offer and demand as well as the analysis of the touristy products and markets would have permitted us to appreciate its role better in its possible quality of second wealth after the hydrocarbons. The lack of acceptable data is the major reason of its impossibility. In all cases, we are going to tempt to appreciate its importance through the three essential questions of economists: why, how and what. To tempt to answer there is making a first step toward the research of the solutions that would facilitate the process of lasting development of the tourism in Algeria.