There many demographer and have difference perspective
on transition stages. C.P. Blacker has presented five stages of transition
phase. These are as follow:
- High stationary population: This stage is similar
to Thomson and Notestein's high potential growth. In a very underdeveloped
economy and traditional social system, the difference in the birth and
death rates is negligible and therefore the population is almost
stationary with irregular fluctuations. Famine and epidemic regularly take
heavy tolls on life. He said that 22 percent of world population was at
this stage till 1930.
- Early expansion stage: fulfillment of food supply brought by higher yields in agriculture and better transportation prevent death due to starvation. Frequent famine and epidemic were under some control, medical facilities were extended to common man, preventive medicines put some check on infections diseases, death rate started to fall slowly but birth rate however continues to stay almost at the biological limit. As a result, the population starts to growth. C.P. estimated that 40 percent of world population was at this stage in 1930.
