Population and resources: Malthus and after

Detail

1. The core question: people versus resources

• When population grows, it needs more food, water, land and energy.
• The debate is whether resources can keep pace, or whether population will one day outrun them.
• Two broad camps:
• Pessimists (Malthus and the Neo-Malthusians) say population will outrun resources unless births are controlled.
• Optimists (Boserup and Julian Simon, the Cornucopians) say human skill and technology will grow resources to match.

2. Malthusian theory of population (1798)

• Thomas Malthus was an English economist and demographer (a person who studies population).
• His book appeared in 1798. Its full title was 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 [3].

• It was a reply to Godwin and Condorcet, who believed society could keep getting better [3].

• Malthusian theory of population means the idea that population tends to grow faster than the food supply. If growth is not checked, it ends in a crash.

• How the crash comes about:
• Population grows geometrically, so it keeps doubling: 1 → 2 → 4 → 8 → 16.
• Food grows arithmetically, so it rises by a fixed amount each time: 1 → 2 → 3 → 4 → 5.
• The gap between people and food grows wider each generation.

• In the end, famine, disease and war cut the population back down.

• Malthus therefore believed poverty and misery could not be escaped without strict limits on having children [3].

Generation	Population (geometric)	Food (arithmetic)	Food per person
1	1	1	1.0
2	2	2	1.0
3	4	3	0.75
4	8	4	0.5
5	16	5	~0.31

3. Preventive and positive checks

• A check is anything that slows or stops population growth.

Feature	Preventive checks	Positive checks
What they act on	Birth rate (they lower it)	Death rate (they raise it)
Examples	Late marriage, moral restraint (choosing not to have children), celibacy (staying unmarried)	Famine, disease, war
Who controls them	Human choice	Nature or disaster
Malthus's view	Better	Painful and to be avoided

• Malthus said preventive checks are better than positive checks.
• His first essay was very gloomy. Later he softened it. By the time he wrote for the 1824 Supplement to the Encyclopædia Britannica, he gave more space to the milder preventive checks, such as delaying marriage and childbearing on purpose [3].
• NCERT position: for resources to stay sustainable, the world must control a rapid rise in population. (NCERT presents Malthus under "Population Control Measures".)

4. Critiques of Malthus

a) Technology beat his forecast

• The agricultural revolution and later the Green Revolution raised food output far faster than "1, 2, 3, 4". (Green Revolution: the use of high-yielding seeds, irrigation and chemical fertilisers from the mid-1960s.)
• India's foodgrain output was 251.54 million tonnes in 2015-16, 332.30 million tonnes in 2023-24, and a record 357.73 million tonnes in 2024-25 (final estimates) [6].

• In 2024-25, rice reached a record 150.18 million tonnes and wheat a record 117.94 million tonnes [6].

• Food supply grew even while India's population grew past 1.4 billion. This is the opposite of what Malthus predicted.

b) Fertility fell on its own as countries developed

• This is explained by the demographic transition: the shift from high birth and death rates to low birth and death rates as a society becomes richer, more urban and more educated.
• Better health care lowers deaths first.
• Later, schooling (especially of girls), city life and the falling need for child labour lower births.

• Growth then slows without famine or war.

• India example:

• Total Fertility Rate (TFR) means the average number of children a woman would have in her lifetime.
• TFR fell from 2.2 (NFHS-4, 2015-16) to 2.0 (NFHS-5, 2019-21) [4].
• This is below the replacement level of 2.1 [4]. (Replacement level is the TFR at which each generation just replaces itself.)
• TFR stayed at 2.0 in NFHS-6, and 31 of 36 States/UTs have reached replacement-level fertility [5].

• India's targets were TFR 2.1 under the National Population Policy 2000 and the National Health Policy 2017 [5].

• World example: the world went from 7 to 8 billion in 12 years. Going from 8 to 9 billion will take about 15 years (to 2037), which shows growth is slowing [2].

c) Ester Boserup (1965): population pressure drives innovation

• Boserup turned Malthus around. For her, food supply is not fixed. It responds to population.
• More people press on the land.
• Farmers then work the land harder: they shorten fallow periods, use irrigation and terracing, and use the plough and manure.

• Output per hectare rises.

• Her model gives a different path of technical and social change in response to population pressure [3].

d) Amartya Sen: famines come from entitlement failure

• Entitlement means a person's ability to get food, either by growing it, buying it with wages, or receiving it through state support.
• Bengal famine, 1943:
• Wartime inflation and rising prices made food too costly for rural labourers, fishermen and artisans.
• Their wages could not buy food, so they lost their entitlement.

• Millions died even though total food in Bengal had not fallen sharply.

• Lesson: famine is often a failure of distribution and purchasing power, not simply too many people for too little food.

5. Neo-Malthusianism

• Neo-Malthusianism is a 20th-century revival of Malthus's fear that population will outrun resources. Unlike Malthus, who preferred moral restraint, it openly supports birth control (contraception and family planning).
• Key works:

Work	Year	Author(s)	Main claim
The Population Bomb	1968	Paul Ehrlich	Fast population growth would cause mass famines in the 1970s–80s
The Limits to Growth	1972	Meadows et al., for the Club of Rome	Computer models showed that growth in population, industry and pollution would hit the planet's limits within about a century

• What happened: the predicted mass famines of the 1970s–80s did not occur. The Green Revolution and falling fertility helped prevent them.
• What survives:
• The idea of carrying capacity: the largest population an area can support over the long term without damaging it.
• The idea of planetary limits is still used in climate change and biodiversity debates.

6. Optimum population

• Optimum population is the population size at which output per person is highest, for a given amount of resources and a given level of technology.

State	Population compared with resources	Result	Example
Underpopulation	Too few people	Resources lie unused; output per head is below its best	Historically Australia and Canada
Optimum	Balanced	Output per head is highest	Not fixed; it keeps moving
Overpopulation	Too many people	Pressure on land, jobs and services; output per head falls	Densely settled, poor farm regions

• The optimum is not a fixed number. When technology improves (better seeds, irrigation, machines), the same land can support more people well. So the optimum moves upward.

7. Cornucopian counterview: Julian Simon (1981)

• A Cornucopian is someone who believes resources are practically unlimited for people who use skill and invention. (The word comes from cornucopia, the "horn of plenty".)
• Julian Simon called human ingenuity (creativity and problem-solving) the "ultimate resource" (1981).
• When a resource becomes scarce, its price rises.
• A higher price pushes people to find substitutes, save the resource or invent new methods.

• So more people means more minds to solve problems.

• This is the opposite of the Neo-Malthusian view.

8. Where the debate stands now

• World population reached 8 billion on 15 November 2022 [2].

• The rise came mainly from longer lives, thanks to better public health, nutrition, hygiene and medicine [2]. In other words, deaths fell. It did not come from births rising.

• UN projections: about 8.5 billion in 2030 and 9.7 billion in 2050, with a peak of about 10.4 billion in the 2080s that holds until 2100 [2].

• The world is now passing through the demographic transition, not heading for a Malthusian crash. Even so, the questions of resources per person and pressure on the planet remain.

Prelims Hooks

• An Essay on the Principle of Population was published in 1798 by Thomas Malthus.
• Malthus: population grows geometrically (1, 2, 4, 8), while food grows arithmetically (1, 2, 3, 4).
• Preventive checks lower births (late marriage, moral restraint, celibacy). Positive checks raise deaths (famine, disease, war). A common trap: famine is a positive check, not a preventive one.
• Matching pairs: The Population Bomb (1968) → Paul Ehrlich; The Limits to Growth (1972) → Club of Rome / Meadows et al.; "ultimate resource" (1981) → Julian Simon; population pressure drives farm innovation (1965) → Ester Boserup; entitlement failure (Bengal 1943) → Amartya Sen.
• Optimum population = the size at which output per head is highest. It shifts as technology changes, so it is not fixed.
• Historical examples of underpopulation: Australia, Canada.
• World population reached 8 billion on 15 November 2022. 7 → 8 billion took 12 years. 9 billion is expected around 2037 [2].
• India's TFR is 2.0 (NFHS-5, 2019-21), below the replacement level of 2.1 [4].
• India's foodgrain output in 2024-25 was a record 357.73 million tonnes [6].

Mains Points

• Why Malthus was proved wrong in practice (GS-I/III):
• Technology (Green Revolution; India's foodgrains rose from 251.54 MT in 2015-16 to 357.73 MT in 2024-25 [6]) broke the "arithmetic food" assumption.
• The demographic transition broke the "geometric population" assumption: India's TFR is now 2.0 [4][5].

• Growth was checked by choice (preventive checks) rather than by disaster.

• Famine and food security policy:

• Sen's entitlement approach shifts the focus from total food output to access: wages, prices and the public distribution system.

• This supports rights-based food security over plain production targets.

• Neo-Malthusian legacy:

• The predicted famines did not happen.
• Carrying capacity and planetary limits now shape climate, water and land-degradation debates.

• The issue today is less about how many people there are and more about how much each person consumes and how sustainably.

• Optimum population as a planning idea: because the optimum moves with technology, the policy answer is to invest in human capital, farm technology and resource efficiency, alongside voluntary family planning (National Population Policy 2000) [5].