What is demographic transition

In the world today not all nations have gone through their demographic transitions. Many countries today aren't rich enough to have begun population growth declines seen in the second half of demographic transition. Countries such as Iraq, Nigeria, Pakistan and the Congo are currently projected to have population growth rates in excess of two percent per year over the next generation, as Figure shows. Though there is also a large group of developing countries such as Korea, Thailand, China and South Africa in which population growth over the subsequent generation is projected to be less than one percent per year. And in the industrialized countries-such as Italy, Japan and Germany-populations are projected to stay nearly the same over next generation.