Unit 4: Population – Resource

1. World Population Composition

Population composition refers to the demographic makeup of a population, which includes measurable characteristics such as age, sex, rural-urban residence, literacy, and occupational structure. Understanding these elements is crucial for analyzing a society's current socio-economic status and planning for future resource allocation.

Age Composition

Age composition represents the number of people in different age groups within a population. It is a critical indicator of the dependency ratio and future growth trends.

• Working Population (15–59 years): The economically active demographic. A large proportion indicates a high demographic dividend.
• Dependent Population (0–14 years and 60+ years): Rely on the working population. High youth populations require investments in education and healthcare; aging populations require investments in geriatric care and pensions.
• Population Pyramids: Graphical representations of age and sex composition.
  • Expanding Pyramid: Triangular shape with a wide base (high birth rates) and narrow top (high death rates). Typical of less developed countries (e.g., Nigeria, Bangladesh).
  • Constant Pyramid: Bell-shaped, tapering towards the top. Birth and death rates are nearly equal (e.g., Australia).
  • Declining Pyramid: Narrow base and narrow top. Low birth and death rates, leading to negative or zero population growth (e.g., Japan, Germany).

Sex Composition

Sex composition is expressed as the Sex Ratio, which is the ratio between males and females in a population.

• Formula: Depending on the country, it is calculated as (Male Population / Female Population) × 1000 or (Female Population / Male Population) × 1000.
• Implications: A skewed sex ratio indicates gender disparities, female feticide/infanticide, lower socio-economic status of women, or sex-selective male migration.

Rural-Urban Composition

The division of population based on residence.

• Rural: Primarily engaged in primary activities (agriculture, fishing, forestry).
• Urban: Primarily engaged in secondary, tertiary, and quaternary activities.
• Significance: Helps in understanding the level of economic development. Developed countries generally exhibit a high rate of urbanization, while developing nations have larger rural populations.

Literacy and Occupational Structure

• Literacy Rate: Indicates the socio-economic development of a country. It directly affects the standard of living, status of females, and technological advancement.
• Occupational Structure: The distribution of the working population across primary, secondary, tertiary, and quaternary sectors. A shift from primary to tertiary/quaternary sectors indicates economic modernization.

2. Distribution, Density, and Growth

Population Distribution

Refers to the spatial pattern of where people live. The world's population is highly unevenly distributed; roughly 90% of the world's population lives on 10% of its land area.

• Ecumene: Permanently inhabited areas of the Earth.
• Non-Ecumene: Uninhabited or very sparsely populated areas (ice caps, dense rainforests, extreme deserts).
• Factors Influencing Distribution:
  • Geographical: Availability of fresh water, flat landforms (plains), favorable climate, and fertile soils.
  • Economic: Availability of minerals, degree of urbanization, and industrialization.
  • Social and Cultural: Religious significance, political stability, and social infrastructure.

Population Density

Density measures the ratio between population and land area, providing a clearer picture of population pressure on resources.

• Arithmetic Density: Total Population / Total Land Area. (Basic measure, but can be misleading if a country has large uninhabitable areas).
• Physiological Density: Total Population / Total Arable (Agricultural) Land. (Better indicator of the pressure on food-producing land).
• Agricultural Density: Total Agricultural Population / Total Arable Land. (Measures farming efficiency; lower in developed countries due to mechanization).

Population Growth

The change in the number of inhabitants of a territory during a specific period.

• Natural Growth: Births - Deaths.
• Actual Growth: (Births - Deaths) + (In-migration - Out-migration).
• Growth Rate: Population change expressed as a percentage.
• Doubling Time: The time required for a population to double in size. Historically, it took centuries, but in the modern era, doubling times have shrunk drastically (though they are now stabilizing).

3. Migration: Concept and Dynamics

Migration is the relatively permanent movement of people across territorial boundaries to change their place of residence.

Types of Migration

1. Internal vs. International: Movement within a country's borders (e.g., rural to urban) vs. movement across national borders.
2. Voluntary vs. Forced: Movement by choice (usually economic) vs. movement driven by conflict, persecution, or environmental disasters (refugees/asylum seekers).
3. Streams of Migration:
   • Rural to Urban (most common in developing nations).
   • Urban to Urban (common in developed nations).
   • Rural to Rural (often seasonal agricultural labor or marriage-related).
   • Urban to Rural (counter-urbanization, driven by the desire for better living environments).

4. Causes and Consequences of Migration

Causes of Migration

Migration is driven by two primary forces:

• Push Factors: Negative conditions at the place of origin that compel people to leave.
  • Examples: Unemployment, poverty, poor infrastructure, political instability, war, natural disasters (droughts, floods), and epidemics.
• Pull Factors: Positive conditions at the destination that attract people.
  • Examples: Better job opportunities, higher wages, superior education and healthcare facilities, peace, stability, and favorable climate.

Consequences of Migration

Migration creates profound impacts on both the source and destination regions.

• Demographic Consequences: Alters the age-sex composition. Source regions often lose young, male working populations (leading to an aging, female-heavy population), while destination regions see a youth bulge.
• Economic Consequences:
  • Source: Benefits from remittances (money sent home), which boost the local economy. However, suffers from a loss of labor.
  • Destination: Gains cheap labor and skills, but faces strain on resources, housing, and infrastructure.
• Social Consequences:
  • Positive: Cultural exchange, diffusion of new ideas, evolution of composite cultures.
  • Negative: "Brain Drain" for the source region (loss of highly educated professionals). Potential for social conflict, xenophobia, and marginalization in the destination region.
• Environmental Consequences: Unplanned urbanward migration leads to overcrowding, slum proliferation, groundwater depletion, and severe pollution in destination cities.

5. Lee's Model of Migration

Proposed by Everett Lee in 1966, this model provides a comprehensive framework for understanding migration by emphasizing that migration is a calculated decision based on multiple variables.

The Four Components of Lee's Model

1. Factors Associated with the Area of Origin:
   Every location has a mix of positive (+), negative (-), and neutral (0) factors. A person will migrate if the negative factors (push factors) significantly outweigh the positive factors.
2. Factors Associated with the Area of Destination:
   The destination also has +, -, and 0 factors. The migrant's perception of these factors acts as the pull.
3. Intervening Obstacles:
   These are the frictions or barriers between the origin and destination that make migration difficult.
   • Examples: Physical distance, physical barriers (mountains, oceans), immigration laws, borders, cost of travel, language barriers.
4. Personal Factors:
   Human beings are not entirely rational or uniform. Personal sensitivities, age, gender, education, family ties, and risk tolerance dictate how individuals perceive the + and - factors and how they navigate intervening obstacles.

Key Takeaway of Lee's Model: Migration volume is directly proportional to the diversity of regions and inversely proportional to the difficulty of intervening obstacles.

6. Demographic Transition Theory

The Demographic Transition Model (DTM) illustrates how a country's population growth trajectory changes in tandem with its socio-economic development. It traces the shift from high birth and death rates to low birth and death rates as a society modernizes.

Stages of Demographic Transition

• Stage 1: High Stationary
  • Characteristics: High Crude Birth Rate (CBR) and High Crude Death Rate (CDR). Population growth is essentially zero.
  • Causes: Lack of family planning, high infant mortality (requiring replacement births), lack of medical care, poor sanitation, and an agrarian economy.
  • Current Examples: No entire country is currently in Stage 1, though some isolated indigenous tribes exhibit these traits.
• Stage 2: Early Expanding
  • Characteristics: CBR remains high, but CDR drops dramatically. Results in a massive population explosion.
  • Causes: Improvements in healthcare, sanitation, water supply, and food production (e.g., the Industrial/Agricultural Revolution).
  • Current Examples: Sub-Saharan African countries (e.g., Niger, Uganda).
• Stage 3: Late Expanding
  • Characteristics: CDR continues to fall, but at a slower rate. CBR begins to decline significantly. Population continues to grow, but the rate of growth slows down.
  • Causes: Urbanization, increased female literacy and employment, access to contraception, and a shift away from subsistence agriculture (children become an economic liability rather than an asset).
  • Current Examples: India, Mexico, Brazil.
• Stage 4: Low Stationary
  • Characteristics: Low CBR and Low CDR. Population growth is zero or very low. Total population is high but stable.
  • Causes: Highly industrialized and urbanized society, strong family planning, high standard of living, and women having careers.
  • Current Examples: USA, UK, Australia.
• Stage 5: Declining (Theoretical/Emerging)
  • Characteristics: CBR drops below CDR. The population begins to shrink naturally.
  • Causes: Extreme aging population, very low fertility rates, high cost of living.
  • Current Examples: Japan, Germany, Italy.

7. Population–Resource Regions (Ackerman's Classification)

Edward A. Ackerman (1970) proposed a macro-regional classification of the world based on the relationship between Population, Resources, and Technology.

Ackerman argued that the standard of living in a region is a function of the available resources, the size of the population, and the level of technology used to exploit those resources.

The Five Population-Resource Regions

1. United States Type (High Technology, High Resource, Low Population)

• Characteristics: Abundant natural resources, advanced technology, and a relatively low population compared to the resource base. High standard of living.
• Dynamics: Society is capable of massive production and has a high per capita income.
• Regions: USA, Canada, Australia, New Zealand, parts of Russia.

2. European Type (High Technology, Low Resource, High Population)

• Characteristics: High population density and depleted or limited domestic natural resources, but highly advanced technology and skilled labor.
• Dynamics: Maintains a high standard of living through industrialization, international trade, importing raw materials, and exporting manufactured, high-value goods.
• Regions: Western Europe (UK, Germany, France), Japan, South Korea.

3. Egyptian Type (Low Technology, Low Resource, High Population)

• Characteristics: The most critical and stressed region. Characterized by a high, rapidly growing population, scarce natural resources, and a lack of technological advancement.
• Dynamics: Extremely low standard of living, high poverty, malnutrition, and reliance on subsistence agriculture. High out-migration pressure.
• Regions: Egypt, Bangladesh, Haiti, many parts of Sub-Saharan Africa.

4. Brazilian Type (Low Technology, High Resource, Low Population)

• Characteristics: Vast, untapped natural resources and a relatively low population density, but lacking the technological and capital infrastructure to exploit resources efficiently.
• Dynamics: Great potential for future economic growth if capital, technology, and infrastructure are introduced. Often relies on foreign direct investment.
• Regions: Brazil, parts of Latin America (Bolivia, Venezuela), Central Africa (DRC), parts of Southeast Asia.

5. Arctic-Desert Type (Technology-Deficient, Harsh Environments)

• Characteristics: Extreme environmental conditions (extreme cold, extreme aridity), very sparse populations, and largely unexploited resources.
• Dynamics: Habitation is restricted to isolated pockets. Survival requires either high-tech intervention (which is expensive) or traditional, subsistence survival methods.
• Regions: Antarctica, the Sahara Desert, the Arctic tundra, the Amazon basin (interior).