Population and Migration | DSE

• Demographic Transition Model (DTM): A model describing the change in birth rates and death rates as a country develops through four or five stages, from high birth and death rates to low birth and death rates.
• Population pyramid: A graphical representation of the age and sex distribution of a population, with males shown on the left and females on the right.
• Fertility rate (total): The average number of children a woman would bear during her lifetime, calculated from age-specific fertility rates.
• Replacement-level fertility: The total fertility rate at which a population exactly replaces itself from one generation to the next, approximately $2.1$ children per woman in developed countries.
• Dependency ratio: The ratio of the dependent population (under 15 and over 64) to the working-age population (15-64), expressed as a percentage.
• Net migration rate: The difference between immigrants and emigrants per 1,000 population per year.

• High birth rates ($40$ to $50$ per 1,000) and high death rates ($35$ to $50$ per 1,000).
• Low rate of natural increase (birth rate minus death rate approximately zero).
• Short life expectancy (below 40 years), high infant mortality.
• Pre-industrial societies with limited healthcare, sanitation, and food supply.
• Few countries remain in Stage 1; some remote communities in sub-Saharan Africa or the Amazon may approximate this stage.

• Death rates fall rapidly due to improvements in healthcare, sanitation, nutrition, and food production.
• Birth rates remain high due to cultural norms, lack of family planning, high infant mortality (encouraging larger families), and the economic value of children in agricultural societies.
• Rapid population growth as the gap between birth and death rates widens.
• Many sub-Saharan African countries are currently in Stage 2.

• Birth rates begin to decline as urbanisation, female education, access to contraception, and changing social norms reduce desired family size.
• Death rates continue to fall but at a slower rate.
• Population growth slows as the gap between birth and death rates narrows.
• Many Southeast Asian countries (Philippines, Vietnam, Indonesia) are in Stage 3.

• Low birth rates ($10$ to $15$ per 1,000) and low death rates ($8$ to $12$ per 1,000).
• Low rate of natural increase; population is approximately stable.
• Long life expectancy (over 75 years), low infant mortality.
• Most developed countries (Japan, Germany, United Kingdom) are in Stage 4.

• Birth rates fall below death rates, producing negative natural increase.
• Population declines unless offset by immigration.
• Very low fertility rates (below $1.5$ children per woman).
• Japan, South Korea, and several European countries exhibit Stage 5 characteristics.

Population pyramids are graphical tools for analysing population structure. The horizontal axis shows population size (or percentage), with males on the left and females on the right. The vertical axis shows age groups.

• Expansive pyramid (wide base): High birth rates and high death rates. Characteristic of Stage 1-2 countries. The wide base indicates many children; the narrow top indicates low life expectancy. Example: Niger, Uganda.
• Constrictive pyramid (narrow base): Low birth rates and low death rates. The narrow base indicates declining fertility; the wider middle sections indicate a large working-age population. Characteristic of Stage 4-5 countries. Example: Japan, South Korea.
• Stationary pyramid (uniform width): Approximately equal proportions across age groups, indicating stable population. Characteristic of Stage 4 countries with near-replacement fertility.

The dependency ratio quantifies the burden on the working-age population:

$\text{Dependency Ratio} = \frac{\text{Population aged 0-14} + \text{Population aged 65+}}{\text{Population aged 15-64}} \times 100$

A high dependency ratio indicates a large dependent population relative to working-age people, with implications for economic productivity, tax revenue, and social service provision. Hong Kong’s dependency ratio has risen to approximately 57 (57 dependents per 100 working-age people), with further increases projected.

Immigration from mainland China has been the dominant source of population growth in Hong Kong. The primary channel is the one-way permit scheme (since 1982), under which mainland Chinese citizens with close family ties to Hong Kong residents (spouses, minor children) are permitted to settle in Hong Kong. Approximately 150 permits are issued daily, representing roughly 55,000 immigrants annually. Other channels include the Quality Migrant Admission Scheme (attracting highly skilled professionals without a prior job offer), the Mainland Professionals Immigration Scheme (for specific sectors facing labour shortages), and study-to-stay pathways for graduates of Hong Kong universities.

Mainland immigration supplies labour for sectors facing shortages (construction, elderly care, healthcare), maintains population growth (without immigration, Hong Kong’s population would decline due to below-replacement fertility), and stimulates consumer demand. However, it also creates pressure on housing, public transport, and social services, generates competition for employment in specific sectors, and produces social tensions arising from cultural differences and perceived competition for resources.

Hong Kong employs approximately 400,000 foreign domestic helpers (FDHs), predominantly from the Philippines and Indonesia. The Employment Ordinance (Cap. 57) governs their employment; helpers must live with their employers and work a minimum of six days per week, with a statutory minimum wage of approximately HKD 4,870 per month. FDHs enable dual-income households by providing childcare, eldercare, and domestic services, thereby increasing female labour force participation. However, they may face exploitation and are restricted to domestic work, creating power asymmetries with employers.

Hong Kong’s population is ageing rapidly. The proportion of people aged 65 and above has increased from approximately 7% in 1981 to over 21% recently, with projections indicating that by 2046, the proportion could exceed 36%. Hong Kong’s total fertility rate has been approximately $0.7$ to $1.0$ children per woman, among the lowest globally and well below replacement level of 2.1. Life expectancy exceeds 85 years for women and 81 years for men. The old-age dependency ratio is projected to rise from approximately 30 to over 70 by 2050.

Hong Kong’s population is ageing due to declining fertility (economic development, high cost of living, expanded educational and career opportunities for women, and changing attitudes toward marriage and family have reduced desired family size below replacement level), increasing life expectancy (advances in healthcare, nutrition, and public health have extended life expectancy dramatically), and immigration patterns that, while providing younger working-age people, are insufficient to fully offset the ageing trend.

Consequences include labour shortages reducing economic productivity, fiscal pressure from increased healthcare and pension demand against a shrinking tax base, strain on the healthcare system, and potential intergenerational equity conflicts over resource allocation.

Several East Asian governments have introduced pro-natalist policies to boost birth rates:

• Baby bonus schemes: Direct cash payments for each child born. Hong Kong introduced a baby bonus of HKD 20,000 per child (subsequently increased), along with enhanced child tax allowances.
• Parental leave: Extended maternity and paternity leave provisions. Hong Kong increased statutory maternity leave from 10 to 14 weeks.
• Childcare support: Subsidised childcare services and Kindergarten and Child Care Centres Registration Ordinance.
• Housing incentives: Priority public housing allocation for families with children.

Despite these measures, Hong Kong’s fertility rate has remained stubbornly low, suggesting that financial incentives alone are insufficient to address the deep economic and social factors driving low fertility.

Measures include expansion of residential care homes and community care services, the Residential Care Services Voucher Scheme, investment in geriatric medicine, the Mandatory Provident Fund (MPF) retirement savings system, and barrier-free access improvements.

The government has sought to attract skilled immigrants through the Top Talent Pass Scheme (introduced 2022, targeting high-income earners and graduates of top-ranked universities) and simplified procedures for professionals and entrepreneurs. These policies aim to replenish the working-age population and address skills shortages.

flowchart TD
    A[Population] --> B[Key Concepts]
    A --> C[Core Principles]
    A --> D[Practical Applications]
    B --> E[Fundamental definitions]
    C --> F[Design patterns]
    D --> G[Real-world usage]

Population is the heartbeat of a society — it tells you how young or old a place is, whether it is growing or shrinking, and where people are moving. South China’s population story is one of dramatic change: from explosive growth during the Mao era to deliberate slowing under the one-child policy, and now facing the consequences of an ageing population. Migration is the great equaliser — it moves people from places with too few opportunities to places with too many, but it also disrupts communities and creates new tensions. The dependency ratio is the invisible burden — when too few workers support too many retirees, the entire social contract is tested.

1. State the DTM stages with reference to specific countries: Do not merely describe the stages generically. For example, “Nigeria is in Stage 2 with a birth rate of approximately 38 per 1,000 and a death rate of approximately 12 per 1,000, producing rapid population growth.”

2. Read population pyramids carefully: Identify the age groups with bulges or indentations. Explain what these features indicate about past demographic events (baby booms, wars, migration, famine).

3. Use specific statistics for Hong Kong: Quote TFR figures (approximately 0.8), life expectancy (over 85 for women), and dependency ratios. These demonstrate precise knowledge.

4. Discuss migration quantitatively: State the approximate number of mainland immigrants annually (around 55,000 through one-way permits), the number of FDHs (approximately 400,000), and the composition by nationality.

5. Evaluate policy effectiveness: When discussing pro-natalist policies, note that no East Asian country has successfully reversed the fertility decline through financial incentives alone. Structural factors (cost of living, housing, work culture) are more significant.

6. Link to other topics: Connect ageing to urban planning (accessibility, elderly care facilities), economic development (labour shortage, productivity), and resources (healthcare demand).

Confusing birth rate with fertility rate: Birth rate is per 1,000 population per year. Total fertility rate is the average number of children per woman. They measure different things and shouldn’t be used interchangeably.

Assuming all countries follow the DTM in order: Some countries skip stages or experience unique patterns. Hong Kong went directly from high growth to very low fertility without the typical Stage 4 stability period.

Mixing up dependency ratio with old-age dependency ratio: The general dependency ratio includes children (0-14) AND elderly (65+). The old-age dependency ratio only counts elderly. Make sure you’re using the right one.

• Population: Population studies are central
• Urbanization: Urbanisation is a key topic
• Climate: Climate affects geography