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If a country's growth rate is 1 percent, the Rule of 70 suggests a doubling time of about 70 years. When will this estimate be less reliable?

Answer and explanation

Correct answer: When the growth rate changes rapidly over time

The Rule of 70 works best when the annual growth rate remains approximately constant. It treats the stated rate as if it continues throughout the whole period. If the rate changes substantially, the population will not follow the simple path assumed by the rule, so the estimated doubling time may differ from the actual time.

A rate of 1 percent gives an approximate doubling time of \(70\div1=70\) years. However, if fertility, mortality, or migration causes the rate to change rapidly, that estimate becomes less reliable. A large population alone does not invalidate the rule, and both births and deaths occur in any normal population. Therefore option B is correct.

Related tags

Rule Of 70Doubling TimeChanging Growth RatePopulation ProjectionPopulation GrowthThe World Population – DistributionDensity And GrowthThe World Population Distribution Density And Growth

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