1. Topic 3 – Population Theory
A – Demographic Transition
B – Malthusianism
C – Neo-Malthusianism
D – Creative Pressure

2. Demographic Transition
1. Concept
What is the demographic transition?
2. Stages
What are the major stages of its occurrence?
3. Geographical Variations
Does the demographic transition occurred at the same time and places?

3. 1
Concept
Overview
A “social modernization” of the reproduction process:
Improved health care and access to family planning.
Higher educational levels, especially among women.
Economic growth and rising per capita income levels.
Urbanization and growing employment opportunities.
Involves moving from one equilibrium to another:
Initial equilibrium: High birth and death rates.
Final equilibrium: Low birth and death rates.
Theory backed by solid empirical evidence.
Involves four phases.

4. 1 Concept Epidemiological Transition
Focuses on changes over time in the causes of mortality affecting certain populations:
Health conditions.
Disease patterns.
Result in a decline in death rates and an increase of life expectancy.
The society goes through a transition from communicative diseases to degenerative diseases.

5. Communicative Diseases Degenerative and Man-made Diseases1
Concept
Stages in epidemiological transition
Three identifiable stages in the transition.
1) Age of communicative diseases.
2) Age of receding pandemics.
3) Age of degenerative and man-made diseases.
Communicative Diseases
High Fertility
High Mortality
30 years
Receding Pandemics
High Fertility
Decreasing Mortality
50 years
Degenerative and Man-made Diseases
Low Fertility
Low Mortality
70 years

6. Survivorship of the British Population, 17th and 20th Centuries
In the United States, by the 1850s, half the children did not reach the age of 5.

7. Demographic Transition Theory1
Demographic Transition Theory
Stage I
Stage II
Stage III
Stage IV
Birth Rate
Population
Demographic
Growth
Death Rate
1700
1800
1900
2000

8. Crude Birth Rates, Western Europe, 1751-1991

9. Crude Death Rates, Western Europe, 1751-1991

10. Stages in Demographic Transition1
Stages in Demographic Transition
Stage I
Stage II
Stage III
Stage IV
High birth rates
Falling birth rates
Low birth rates
No or little Family Planning
Parents have many children because few survive
Many children are needed to work the land
Children are a sign of virility
Religious beliefs and cultural traditions encourage large families
Family Planning used
A lower infant mortality rates
Industrialization means less need for labor
Increased desire for material possessions and less desire for large families
Emancipation of women
Children as liabilities instead of assets
High death rates
Falling death rates
Low death rates
Disease and plague (e.g. bubonic, cholera, kwashiorkor)
Famine, uncertain food supplies and poor diet
Poor hygiene, no clean water or sewage disposal
Improved medicine
Improved sanitation and waters supply
Improvements in food production in terms of quality and quantity
Improved transport to move food
A decrease in child mortality

11. Fertility Declines, Real and Projected (1950-2050)
Trends in Fertility Rates by Region,
Striking fertility declines are evident in rapidly developing countries such as Bangladesh, the Republic of Korea, and Singapore in Asia, and Colombia in Latin America. For more information see
Source: United Nations (U.N.) Population Division, World Population Prospects, (The 1996 Revision), on diskette (U.N., New York, 1996).
Notes: Projections from 1995 to 2050 are based on the assumption that a goal of fertility rates of 2.1 children per woman in the year 2050 will have been achieved. Values are based on 5-year rates.

12. Geographical Variations3
Geographical Variations
Developed countries
Took 250 years for most developed economies to go through their own demographic transition (from 1750 to 2000).
Population growth never surpassed the capacity of these economies to accommodate it.
Developing countries
Demographic transition started in the 20th century:
The most advanced segment after WWI.
The least advanced segment after WWII.
Very few have went trough the transitory mutation.
Most of them have a type III demographic transition.
By the time they reach type IV, a huge amount a population will be added to their populations.

13. Beginning of Demographic Transition3
Beginning of Demographic Transition

14. Fertility Transition in some Countries, 1962-20003
Fertility Transition in some Countries,
Source: World Health Organization.

15. Geographical Variations3
Geographical Variations
Will demographic transition occur all around the world?
Model based upon the Western experience.
Evidence underline that the process is likely.
Problems:
The base population in the developing world is large.
Low percentages of population increase will result in large numbers of additional people.
Limited possibilities for immigration (Unlike Europe at the end of the 19th century and early during the 20th century).
Religious and cultural influences.

16. B Malthusianism 1. Concept 2. The Malthusian Crisis
What are the principles of Malthusianism?
2. The Malthusian Crisis
What does a Malthusian crisis involves?
3. Contemporary Issues

17. 1
Concept
Context
Thomas Malthus ( ) in his book “Essays on the Principle of Population” (1798).
Relationships between population and food resources (area under cultivation).
Growth of available resources is linear while population growth is often non-linear (exponential).
Took notice of famines in the Middle Ages, especially in the early 14th century (1316).
From the data he gathered, population was doubling every 25 years.
Over a century’s time, population would rise by a factor of 16 while food rose by a factor of 4.
Deficit
Demographic
growth
Resource
growth

18. 2 The Malthusian Crisis The “Malthusian crisis”
Available agricultural spaces are limited.
Technical progresses (machinery, irrigation, fertilizers, and new types of crops) are slow to occur.
Increasing incapability to support the population.
If this persists, the population will eventually surpass the available resources.
The outcomes are “Malthusian crises”:
Food shortages.
Famines.
War and epidemics.
“Fix” the population in accordance with available resources.
Necessity of a “moral restraint” on reproduction.

19. 2 The Malthusian Crisis Resources Population Quantity
Technological Innovation t1
Resources
Overexploitation
Time

20. 2 The Malthusian Crisis The Malthusian Crisis has not occurred
Malthus has been criticized on several accounts during the last 200 years.
Religious view (Protestantism), racist and elitist.
Did not foresee the demographic transition:
Changes in the economy that changed the role of children in the industrializing societies.
Failed to account for improvements in technology:
Enabled food production to increase at rates greater than arithmetic, often at rates exceeding those of population growth.
Enabled to access larger amounts of resources.
Enabled forms of contraception.

21. 3 Contemporary Issues The Malthusian crisis today Demographic growth:
Between 1960 and 2000, three billion persons were added to the global population.
To sustain this growth, agricultural resources had to be doubled.
Required housing space surpassed all that was constructed since the beginning of mankind.
Agricultural growth:
Between 1960 and 1990, grain yields has increased by 92% while cultivated surfaces have only increased by 8%.
Foresee a limit to growth in agricultural production.
Consumption growth.
Environmental degradation.

22. 3 Contemporary Issues Relevance of the Malthusian theory
Was Malthus right or the trend in agricultural production will again increase to surpass population growth?
Are improvements in agricultural techniques enough to answer demand?
The next 25 years will be crucial and will bring forward answers to these questions.
The work of Malthus continues to be important to demographers:
Influence of many contemporary theorists from various academic disciplines.
Built upon Malthus’s ideas and linked them to modern sciences.

23. C Neo-Malthusianism 1. Neo-Malthusian Concepts 2. The Commons
How can the Malthusian theory be adapted to the current situation?
2. The Commons
In which way common resources are used?
3. Neo-Malthusianism and Human Reproduction
Is reproduction a right or privilege?

24. Neo-Malthusian Concepts1
Neo-Malthusian Concepts
Carrying capacity
Issue linked with the carrying capacity of land.
Limits to absorb ever-greater numbers of people.
Population growth has environmental impacts.
Support of family planning, contraception and abortion.
Population problems cannot be addressed through technology beyond the short term.
Overpopulation
A multidimensional issue linked with the carrying capacity.
Numbers should be linked with level of consumption.
The United States would be more overpopulated than China.

25. Neo-Malthusian Concepts1
Neo-Malthusian Concepts
Population bomb
Fast population growth seen as a threat:
The word “bomb” obviously refer to the lethal character of the problem.
Brought forward by Paul Ehrlich in the late 1960s.
Most Third World countries were in the middle of their demographic transition at the time.
Ehrlich and others continued the basic Malthusian numbers game in which population growth outstrips food production.
Moved Beyond Malthus in their consideration of many environmental issues.

26. Neo-Malthusian Concepts1
Neo-Malthusian Concepts
Limits to growth
“Club of Rome”, 1972
Scientific report on the limits to growth.
Used computer models for the first time:
Population growth, food per capita, industrial output, resources and pollution.
Blaming huge waste of resources by developed economies.
Supporting a zero growth policy.
Main arguments:
Resources are in finite number.
Demographic growth cannot occur indefinitely.
Must stop at some point.
Population
Industrial output
Resources

27. 2 The Commons Definition Resources that we share as a population:
Land and other inputs into the food production process.
Oceans and their contents, particularly fish as a food source.
The atmosphere.
Sources of energy.
Landscape for recreational purposes.
Resources of the commons are in finite quantities while access is free (in theory).
The world is finite and can support only a finite population:
Population growth must eventually equal zero.
Otherwise we have to abandon certain freedoms of access to the Commons.
The only way freedoms can be saved is by relinquishing the freedom to breed.

28. 2 The Commons Example of using the commons
Decision on whether to increase the size of herd that grazes on common lands.
A rational being seeking to maximize his gain:
Positive component of adding animals is additional income from additional animals.
Negative component is the overgrazing caused by the additional animals.
The costs are shared by those using the common grazing lands.
Decision to add the extra animals to his herd.
Unfortunately, all of the other villages will arrive at the same conclusion, do the same thing.
The outcome is the ruin to the environment.

29. 2 The Commons Village 4 1 Commons (sustain 14) 2 3 Village 1 2 3 4
Cattle
Commons
14 – 12 = 2
(+1)
14 – 16 = -2 (overgrazing)
Village 4 1
Commons
(sustain 14) 2 3
Cattle (grazing)
Benefits: +1 each
Costs: -1 each

30. 2 The Commons The tragedy of the commons Solutions
Freedom in a commons brings ruin to all.
All the resources will be used.
Solutions
Private property:
Removes some of the Commons from access.
Encourages conservation and wise management.
Vested interest in maintaining it for future use.
Collective property:
Parts of the Commons not possible to divide into private segments - atmosphere, oceans, etc.
Collective (global) ownership.
Taxation and coercive laws as the primary means of preservation.

31. World Fish Catch per Capita, 1950-19992
World Fish Catch per Capita,
Source: WorldWatch Institute.

32. 2
Commercial Harvests in the Northwest Atlantic of Some Fish Stocks, (in 1,000 metric tons)
Commercial Harvests in the Northwest Atlantic of Some Important Fish Stocks,
According to an FAO analysis, based on fish harvest records from 1950 to 1994, 35 percent of the most important commercial fish stocks show a pattern of declining yields and require immediate action to halt overharvesting. Another 25 percent show steady yields but are being fished at their biological limit and are vulnerable to declines if fishing levels increase. For more information see
Source: Food and Agriculture Organization of the United Nations (FAO), Fishstat-PC (FAO, Rome, 1997).

33. Carbon Emissions from Fossil Fuel Burning, 1751-2001
Source: WorldWatch Institute.

34. Neo-Malthusianism and Human Reproduction3
Neo-Malthusianism and Human Reproduction
Human reproduction
Malthus was advocating “moral restraint”:
A religious bias.
Modern contraception:
A tool of population control (state perspective).
A tool of freedom in reproductive choice (market perspective).
Against subsidizing reproduction:
Welfare state.
Many international aid programs.
Remove the punishment (such as children starving to death) from having too many offspring.

35. Neo-Malthusianism and Human Reproduction3
Neo-Malthusianism and Human Reproduction
Freedom to breed
Clashes between neo-Malthusianism and human rights.
UN’s Declaration of Human Rights:
Defense of the individual family’s right to determine family size.
Support the freedom to breed for political reasons.
Few governments are able or willing to enforce restrictions on the reproduction of their populations.
Human population control cannot be achieved through voluntary means.
With freedom to breed comes equal obligations:
Responsibility to the welfare of the children.
Difficult concept to grasp, especially by an uneducated population.
Each new individual competes with other for resources.

36. D The Creative Pressure 1. Concept and Issues
What does the creative pressure theory imply?
2. Limits to Productivity
What may be the limits to productivity?
3. Creative Pressure vs. Neo-Malthusianism
Can Neo-Malthusianism and creative pressure be reconciled?

37. 1 Concept and Issues Concept ?
Opposed to the Malthusian and Neo-Malthusian perspectives.
Brought forward in the early 1960s.
View shared by several economists.
Population has a positive impact on economic growth.
“Necessity is the mother of all inventions”.
Population pressure forces the finding of solutions:
Agriculture.
Economy.
Demographic growth
Problem
Higher occupation
densities ?
Pressures to increase
productivity
Solution
Innovations
Productivity growth
Outcome

38. 1 Concept and Issues Technological innovation and agriculture
Intensification of agriculture.
New methods of fertilization.
Pesticide use.
Irrigation.
Multi-cropping systems in which more than one crop would be realized per year.
Creative pressure and global population growth
Would lead to new productivity gains.
Humans don’t deplete resources but, through technology, create them.
Resources will become more abundant.
Help overcome shortage in food production and employment.

39. Limits to Productivity2
Limits to Productivity
Limits of food production by environmental factors
Soil exhaustion and erosion.
Evolutionary factors such as the development of greater resistance to pesticides.
Climate change.
Loss of productive soils due to land use conversion to other purposes, such as urbanization.
Water shortages and pollution.
Limits by technology
May be available but not shared.
Maybe too expensive for some regions (e.g. desalination).

40. Creative Pressure vs. Neo-Malthusianism3
Creative Pressure vs. Neo-Malthusianism
Carrying capacity
Environmental
degradation
Neo-Malthusianism
21st century
Creative
pressure
Resources
Malthusianism
19th-20th century
Population
Demographic transition

41. Creative Pressure vs. Neo-Malthusianism3
Creative Pressure vs. Neo-Malthusianism
Neo-Malthusianism
Population consumes resources.
Population growth has environmental consequences.
Notion of carrying capacity.
Population should be controlled by strict family planning policies.
Overpopulation linked with levels of consumption.
Creative Pressure
Population induces the creation of resources and the substitution to alternative sources.
“Necessity is the mother of all inventions”.
Population will adjust itself to the quantity of available resources.