Terghini S. In a rapidly changing environment, and in the face of changes in the economic institution, it had to be diligent in order not to be forced out of the market by its competitors. So they have to innovate and put new in the market, and the economic foun. jeemr [Internet]. 2017Dec.1 [cited 2024Jul.22];1(02):224-41. Available from: http://journals.lagh-univ.dz/index.php/jeemr/article/view/318