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A country's natural increase rate falls from 2 percent to 1 percent, yet the number of people added each year remains roughly similar. How is this possible?

Answer and explanation

Correct answer: The population base has become much larger

The number of people added is an absolute increase, while a growth rate is a percentage of the population base. A lower rate can still produce a similar number of people if it is applied to a much larger population. Therefore, the most appropriate explanation is that the population base has become much larger, which is choice A.

For example, 2 percent of 50 million is 1 million, and 1 percent of 100 million is also 1 million. The rate has fallen by half, but the larger base keeps the absolute addition the same. In general, \(\text{absolute increase}=\text{rate}\times\text{population base}\). Rates and numbers are therefore not identical, and death rate still matters when calculating natural increase. The situation is mathematically possible.

Related tags

Population BaseAbsolute GrowthGrowth Rate DeclinePopulation ArithmeticPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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