Explain the basic argument of the …

One of the significant theory in demography is the theory of demographic transition. This theory says that the population growth is directly related to the overall levels of economic development and generally every society follows a typical pattern of development related to population growth. Three basic phases of population growth are there. The first phase is of low population growth in an underdeveloped and technologically backward society. Growth rate in this is low because death rate and birth rate both are very high. That is why difference between the both or net growth rate is low. The third phase is also one of low growth in a developed society where both the birth rate and death rate have been reduced to a great extent and there is very less gap between both of them. But there is transitional stage between the two, which is a movement from a backward to an advanced stage. This stage has a feature of very high rates of growth of population.
Transitional phase is related to population explosion because death rate is brought down quickly through better nutrition, public health and advanced methods of disease control. But birth rate does not reduce to such an extent and that is why growth rate goes high. Many countries are struggling to reduce the birth rate in keeping with the falling death rate.