The interval required to double a quantity under constant-rate exponential growth. Solving with the natural logarithm gives . At per time unit, it is approximately time units; every subsequent doubling takes the same interval.
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Doubling time refers to the period it takes for a quantity to double in size or value at a consistent growth rate. It is commonly used in various fields, including finance, population studies, and resource management, to understand how quickly a given quantity is increasing. The concept can be mathematically expressed using the Rule of 70 or Rule of 72, which provides a quick way to estimate doubling time in terms of growth rate.