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A country's growth rate is declining, yet the number of people added each year may continue to rise for some time. What is the main reason?

Answer and explanation

Correct answer: A lower rate applied to a large and growing population base can still add many people

A growth rate is a percentage applied to the population base, whereas the number added is an absolute quantity. If the base population is very large and continues to grow, even a declining positive percentage can produce many additional people. Therefore, a lower rate does not necessarily mean that the yearly addition immediately becomes smaller.

For example, 2% of 100 million is 2 million, while 1.5% of 150 million is 2.25 million. The rate has fallen, but the number added has risen because the base is larger. Land area is not required to increase, and migration is not the main explanation in the stated case. Hence, option D is correct.

Related tags

Population MomentumLarge Population BaseDeclining Growth RateAbsolute IncreasePopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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