Population growth is the first condition for economic development. The influence of population on economic development has been analyzed in the theory of demographic transition. The relation between demography and economics is the closest but both are the independent sciences today.
Kingsley Davis given the following points of relationship between demography and sociology. Fertility is connected with the attitudes and social institutions. Population changes are related to social and economic change. The labor force is concerned with the population structure and social organization.
Geography is concerned with the relationship of human beings with their environment. It studies the how the people cope and influence with their environment. It is concerned with the behavior of an individual in a particularly area. So, demography is the study of the human population in a particular place in a particular time. Both are closely related to each other.
The intimate relationship between demography and Biology is pointed out by Hutchison and Dewy, called biology as bio-demography
important problem of population are given by Warren S. Thompson as under. 1. What are the changes `that takes place in the size of population and how are these changes brought about? 2. Where the people found and what are the changes taking place in their distribution in communities and other areas?
Demography and population studies are the same. The study of human population is known as population studies or demography literally speaking, demography is the combination of two Greek words “Demo” means people and “graphy” means to write or draw. So, it is the science of population. Population studies is concerned with the whole study of population.
The importance of demography is clear for its scope. Since its scope is increasing which already leads to it importance. Demography is concerned with the growth and distribution of population in less developed countries as well as underdevelopment and developed countries.
Basically demography is the study of population and population is studied in the form of its size. Demography studied that how the size of the population is in en area? In India population census are undertaken after every ten years. The demographers of different countries trying to find out the size of the population of their countries.