Difference in the birth, death and migration of an area between two points of time leads to the size of population thus resulting in population. Population growth is low in developed countries than the developing countries. Population growth and economic developments are negatively correlated. In a developing country with a large population, even a small annual growth rate will lead to a huge change in population. Even if the growth rate continues to decline, the total population grows each year.
Presently the population of the world is 7.033 billion and is increasing at an alarming rate with more than 8 crores being added every year. Though the developed nations have stabilised their growth, the developing nations are yet to reach that target. The population in the developing nations is bound to increase in the coming years as the proportion of their youthful population is high.