Abstract
The knowledge in the modern age is the crucial factor is important for growth and economic development as well as other factors of production. suffer most of the least developed countries of the slight increase in per capita income compared with developed countries and there is a large gap in income between these two groups of countries. A gap to the other no less important than the gap of knowledge and of scientific and technological progress, information technology and communications, which requires the least developed countries should strive to bridge. The recognition of the concept and the importance of measuring the income gap and knowledge gap or Cognition Gap between developed and less developed countries helps to understand the nature of two gaps and then draw policies to fill this gap, and research suggests that the income gap is greater than the knowledge gap and concluded research that the least developed countries suffer from the widening gap income, knowledge, and the income gap is greater than the knowledge gap during the study period.
