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Why can it be misleading to say that population increase becomes exactly one-third when the growth rate falls from 3 percent to 1 percent?

Answer and explanation

Correct answer: Because absolute increase also depends on population size

A percentage growth rate describes proportional change, not the exact number of people added. When a rate falls from 3 percent to 1 percent, the rate itself becomes one-third of its former value. However, the absolute increase is calculated by applying the rate to the population base, so the base population must also be known.

For example, 3 percent of 1 million is 30,000, while 1 percent of 2 million is 20,000. The latter is not necessarily one-third of the former because the population bases differ. Even with the same base, the added number would be one-third in a single comparable period, but changing population size and time context can alter the comparison. Thus option A is the sound caution.

Related tags

Growth Rate Versus Absolute GrowthPopulation BasePercentage InterpretationPopulation DynamicsPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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