Using the Rule Of 70, a population which grows at 1% per annum doubles in 70 years. A population which grows at 2 % doubles in 35 years. Both are considered fine examples of exponential growth (each at a constant rate of growth, producing a lovely exponential curve). The question is, if a population grows at variable rates, but always between 1 and 2 % (and thus is guarenteed to double in 35 to 70 years) - is this exponential growth?
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