We've tow opinions. For (Cohen et Levinthal, 1989 ; Glass et Saggi, 1998 ; Wang et Blomstrom, 1992 ; Blomstrom et Kokko, 1998), the large technological gap between developed and less developed countries, harm to technology transfer, local businesses need a minimum of absorptive capacity to benefit from the positive effects. For others(Findlay, 1978 ; Wang et Blomstrom 1992 ; Blalock et Gertler, 2008), assert that in order to make the most of externalities, local businesses must have a significant technological gap, thus having a wide range of improvement.