Editing Thomas Robert Malthus (section)

== ''An Essay on the Principle of Population'' ==
{{main|An Essay on the Principle of Population}}
Malthus argued in his ''Essay'' (1798) that population growth generally expanded in times and in regions of plenty until the size of the population relative to the primary resources caused distress:
{{blockquote|Yet in all societies, even those that are most vicious, the tendency to a virtuous attachment [i.e., marriage] is so strong that there is a constant effort towards an increase of population. This constant effort as constantly tends to subject the lower classes of the society to distress and to prevent any great permanent amelioration of their condition.|Malthus, T.&nbsp;R. 1798. ''An Essay on the Principle of Population.'' Chapter II, p. 18 in [[Oxford World's Classics]] reprint.}}

Malthus argued that two types of checks hold population within resource limits: ''positive'' checks, which raise the death rate; and ''preventive'' ones, which lower the birth rate. The positive checks include hunger, disease and war; the preventive checks: [[birth control]], postponement of marriage and [[celibacy]].<ref>Geoffrey Gilbert, introduction to Malthus T.R. 1798. ''An Essay on the Principle of Population''. Oxford World's Classics reprint. viii</ref>

The rapid increase in the global population of the past century exemplifies Malthus's predicted population patterns; it also appears to describe socio-demographic dynamics of complex [[pre-industrial society|pre-industrial societies]]. These findings are the basis for neo-Malthusian modern mathematical models of ''long-term historical dynamics''.<ref>See, e.g., [[Peter Turchin]] 2003; [http://cliodynamics.info/PDF/Turchin_Korotayev_SEH_2006.pdf Turchin and Korotayev 2006] {{webarchive|url=https://web.archive.org/web/20120229202712/http://cliodynamics.info/PDF/Turchin_Korotayev_SEH_2006.pdf |date=29 February 2012 }}; Peter Turchin et al. 2007; [[Andrey Korotayev|Korotayev]] et al. 2006.</ref>

Malthus wrote that in a period of resource abundance, a population could double in 25 years. However, the margin of abundance could not be sustained as population grew, leading to checks on population growth:
{{blockquote|If the subsistence for man that the earth affords was to be increased every twenty-five years by a quantity equal to what the whole world at present produces, this would allow the power of production in the earth to be absolutely unlimited, and its ratio of increase much greater than we can conceive that any possible exertions of mankind could make it ... yet still the power of population being a power of a superior order, the increase of the human species can only be kept commensurate to the increase of the means of subsistence by the constant operation of the strong law of necessity acting as a check upon the greater power.|Malthus T. R. 1798. ''An Essay on the Principle of Population''. Chapter 2, p. 8<ref name="Oxford World's Classics reprint">Oxford World's Classics reprint</ref>}}In later editions of his essay, Malthus clarified his view that if society relied on human misery to limit population growth, then sources of misery (''e.g.'', hunger, disease, and war) would inevitably afflict society, as would volatile economic cycles. On the other hand, "preventive checks" to population that limited birthrates, such as later marriages, could ensure a higher standard of living for all, while also increasing economic stability.<ref>Essay (1826), I:2. See also A:1:17</ref> Regarding possibilities for freeing man from these limits, Malthus argued against a variety of imaginable solutions, such as the notion that agricultural improvements could expand without limit.<ref>{{Cite book|url=https://books.google.com/books?id=9-q_SSfE6skC&pg=PA5 |title=An Essay on the Principle of Population (Two Volumes in One)|last=Malthus|first=Thomas Robert|date=2011-12-01|publisher=Cosimo, Inc.|isbn=9781616405700|pages=5–11|language=en}}</ref>

Of the relationship between population and economics, Malthus wrote that when the population of laborers grows faster than the production of food, real wages fall because the growing population causes the [[cost of living]] (''i.e.'', the cost of food) to go up. Difficulties of raising a family eventually reduce the rate of population growth, until the falling population again leads to higher real wages.

In the second and subsequent editions Malthus put more emphasis on ''moral restraint'' as the best means of easing the poverty of the lower classes."<ref>Geoffrey Gilbert, introduction to Malthus T.R. 1798. ''An Essay on the Principle of Population''. Oxford World's Classics reprint, p. xviii</ref>

=== Editions and versions ===
* 1798: ''An Essay on the Principle of Population, as it affects the future improvement of society with remarks on the speculations of Mr. Godwin, M. Condorcet, and other writers.''. Anonymously published.
* 1803: Second and much enlarged edition: ''An Essay on the Principle of Population; or, a view of its past and present effects on human happiness; with an enquiry into our prospects respecting the future removal or mitigation of the evils which it occasions''. Authorship acknowledged.
* 1806, 1807, 1816 and 1826: editions 3–6, with relatively minor changes from the second edition.
* 1823: Malthus contributed the article on ''Population'' to the supplement of the [[Encyclopædia Britannica]].
* 1830: Malthus had a long extract from the 1823 article reprinted as ''A summary view of the Principle of Population''.<ref>dates from Malthus T.R. 1798. ''An Essay on the Principle of Population''. Oxford World's Classics reprint: xxix Chronology.</ref>