Question

Developed nation have high
doubling time
whereas developing nation have
less doubling time of population.
Explain the
statement?
​

Answer 1

PIP: Using population doubling time (the number of years it would take a population to double assuming a constant growth rate), to look backward to examine when today's population totals were half their current size reveals a striking divergence in patterns of change in Africa, Latin America, and Asia. In Africa, for example, the population has doubled from 1970 to 1994 and is expected to double again in the next 24 years. Ethiopia has doubled since 1967 and will double again in 23 years. Egypt has doubled since 1964 and will double again in 31 years at its current growth rate of 2.3%. Latin America doubled its population from 1864 to 1994 and will do so again in 38 years. Mexico will need 33 years to double, but Brazil will take 43 years. In Asia, the population doubled in 33 years and will probably double again in 39 years. Japan, however, doubled in 66 years and will not double again for 183 years. Bangladesh, on the other hand, has a current doubling time of 29 years. To understand the effect of fertility change on doubling time, it is instructive to consider that the population of the world was half its current size in 1957 with a growth rate of 1.85% which would have resulted in 40 million fewer people today were it not for a temporary boast in growth rate to 2.1% in the late 1960s. Short doubling times are expected to continue in developing countries at least until the beginning of the 21st century.