Population & Migration

**Topic: Population & Migration**

This topic explores the dynamics of the human population, including how and why it changes in size and structure over time and space. We will investigate the key factors driving population growth, analyse the Demographic Transition Model, interpret population pyramids, and examine the causes and consequences of migration.

#### 1. Population Dynamics

The change in a country's population is determined by two main components: natural change and migration.

* Birth Rate (BR): The total number of live births per 1,000 people in a population in a year. A high birth rate (e.g., above 30 per 1,000) is typical of less developed countries, while a low birth rate (e.g., below 15 per 1,000) is characteristic of more developed countries.

* Death Rate (DR): The total number of deaths per 1,000 people in a population in a year. It is also referred to as the mortality rate.

* Natural Increase: This is the change in population due to the balance between births and deaths, excluding migration. The Rate of Natural Increase is calculated as:

`Natural Increase Rate (%) = (Birth Rate - Death Rate) / 10`

For example, if Pakistan has a BR of 28 and a DR of 7, its natural increase rate is (28 - 7) / 10 = 2.1% per year.

* Population Growth Rate: This is the overall change in population and provides a more complete picture by including migration.

`Population Growth Rate = Natural Increase Rate +/- Net Migration`

#### 2. The Demographic Transition Model (DTM)

The DTM is a model that shows how a country's population is likely to change over time as it develops economically and socially. It is broken down into five stages.

* Stage 1: High Stationary

* Characteristics: High birth rates and high, fluctuating death rates result in a stable or slowly growing population.

* Reasons: High BR due to lack of contraception and need for large families for farm labour. High DR due to disease, famine, and poor sanitation.

* Example: No country is currently in Stage 1, but remote indigenous tribes may exhibit these characteristics.

* Stage 2: Early Expanding

* Characteristics: Death rate falls rapidly, but the birth rate remains high. This leads to a very rapid population increase (population explosion).

* Reasons: DR falls due to improved healthcare (vaccinations), sanitation (clean water), and a more stable food supply.

* Example: Many Sub-Saharan African countries like Niger and Angola.

* Stage 3: Late Expanding

* Characteristics: Birth rate begins to fall, while the death rate continues to fall but more slowly. Population growth slows down.

* Reasons: BR falls due to increased access to contraception, female education and empowerment, and lower infant mortality rates (meaning less need for 'replacement' children). Urbanisation also reduces the need for child labour.

* Example: Pakistan is considered to be in this stage. Its death rate has fallen significantly, but social and cultural factors keep the birth rate relatively high, though it is now declining.

* Stage 4: Low Stationary

* Characteristics: Low birth rate and low death rate. The population becomes stable with a high total population.

* Reasons: High standard of living, widespread access to family planning, and more women in the workforce.

* Example: USA, UK, France.

* Stage 5: Declining

* Characteristics: The birth rate falls below the death rate, leading to a natural decrease and a shrinking, ageing population.

* Reasons: An ageing population and economic factors may lead couples to have fewer than two children (below replacement level).

* Example: Japan, Germany, Italy.

* Exam Trap: The DTM is a generalised model based on the experience of Western European countries. Do not assume all countries will follow the exact same path or timeline. Factors like government policy, conflict, or disease can alter a country's progression.

#### 3. Population Structure & Pyramids

A population pyramid (or age-sex pyramid) is a bar graph that shows the distribution of a population by age and gender. Its shape reveals a country's population structure and stage in the DTM.

* Expansive Pyramid (Stage 2/3):

* Shape: Wide base, tapering to a narrow top (concave sides).

* Indicates: High birth rate, high death rate, and short life expectancy. It shows a youthful population. A large proportion of the population is young, creating a high dependency ratio (the ratio of non-working dependents (0-14 and 65+) to the working population (15-64)). Pakistan's pyramid reflects this structure.

* Stationary Pyramid (Stage 4):

* Shape: More rectangular, with straighter sides and a base that is not significantly wider than the middle sections.

* Indicates: Low birth rate, low death rate, and long life expectancy. The dependency ratio is lower.

* Constrictive Pyramid (Stage 5):

* Shape: Narrow base and a wide top.

* Indicates: Very low birth rate and an ageing population. This leads to a high dependency ratio, with pressure on healthcare and pension systems.

#### 4. Migration

Migration is the movement of people from one place to another to live. It can be internal (within a country) or international (between countries).

* Push Factors: Negative conditions that force or encourage people to leave a place.

* *Economic:* Unemployment, low wages, lack of opportunity.

* *Social:* Poor services (healthcare, education), persecution.

* *Environmental:* Natural disasters (floods, droughts, earthquakes), climate change.

* *Political:* War, conflict, political instability.

* Pull Factors: Positive conditions that attract people to a new place.

* *Economic:* Job opportunities, higher wages, a better standard of living.

* *Social:* Better services, family links, greater freedom.

* *Environmental:* Safer, more stable environment.

* *Political:* Political stability and safety.

* Types of Migration:

* Voluntary: The migrant chooses to move, usually for economic reasons.

* Forced: The migrant has no choice but to move due to persecution, conflict, or natural disaster. This creates refugees (who cross an international border) and Internally Displaced Persons (IDPs) (who remain within their own country).

* Impacts of Migration: Migration affects both the source country and the destination country.

* Source Country (e.g., Pakistan):

* *Positives:* Receives remittances (money sent home by migrants), which boosts the economy. Reduced pressure on jobs and resources.

* *Negatives:* Brain drain (loss of skilled and educated workers). Ageing population left behind.

* Destination Country (e.g., UAE, UK):

* *Positives:* Fills labour shortages, cultural enrichment, economic growth.

* *Negatives:* Strain on social services, potential for social tension, downward pressure on wages in some sectors.