g by a constant degree, while population growth is exponential, meaning that growth is determined by an exponential function involving a variable multiplier.
Malthus says that if population is left unchecked, it will double every 25 years or so, an increase that is a geometric ratio. Over the same period, says Malthus, it might be possible to double the rate of production of a given spot of earth. However, over the second 25 years, as the population doubles once more, it will not be possible to increase subsistence prod
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