“Population, when unchecked, increases in a geometrical ratio, Subsistence, increases only in an arithmetical ratio.”

— Thomas Robert Malthus

Source: An Essay on The Principle of Population (First Edition 1798, unrevised), Chapter I, paragraph 18, lines 1-2

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Thomas Robert Malthus 60

British political economist 1766–1834

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“The immediate cause of the increase of population is the excess of the births above deaths; and the rate of increase, or the period of doubling, depends upon the proportion which the excess of the births above the deaths bears to the population.”

Thomas Robert Malthus (1766–1834) British political economist

Essay on the Principle of Population (1798; rev. through 1826)

“Population, when unchecked, increases in a geometrical ratio, Subsistence, increases only in an arithmetical ratio.”

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Thomas Robert Malthus 60

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