1.Previous
3.Next

the net reproduction rate (NRR) is exactly one, because the NRR takes both mortality rates and sex ratios at birth into account. As of 2010, about 48% (3.3 billion people) of the world population lives in nations with sub-replacement fertility. Nonetheless most of these countries still have growing populations due to immigration, population momentum and increased life expectancy.

1.Previous
3.Next