According to the classical growth theory of Thomas Malthus,

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According to Malthus, increases in real GDP per person are only temporary because they would result in population growth, which would in turn lead to resource depletion and a decrease in real GDP per person. Malthus believed that population growth would always outstrip increases in food production, leading to a continual cycle of growth and decline. Therefore, sustainable increases in real GDP per person were not possible in the long run, according to Malthus.

According to the Classical Growth Theory of Thomas Malthus