Population: growth, structure and migration

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Distribution and density

Distribution describes the spatial pattern of population. Density is the number of residents divided by land area: an invented 120,000 people across 300 km² gives 400 people/km². Averages can conceal cities and sparse rural areas within the same region.
Physical influences include water, climate, relief and soil; human influences include employment, transport, services, history and policy. These interact. Neither deserts nor fertile land determine population numbers on their own, and density does not establish wealth or quality of life.

Invented density calculation

Population change

Use the same place and period. Natural change = births − deaths; net migration = immigration − emigration. Total change = natural change + net migration. In the invented table, 1,200 − 800 = +400 naturally, while 300 − 500 = −200 through migration, producing +200 overall.
Crude birth and death rates express annual events per 1,000 total residents, commonly using a mid-year denominator. A birth rate of 18 and death rate of 7 give natural increase 11 per 1,000, or 1.1% before migration. Crude birth rate differs from fertility per woman; age structure affects crude rates.
Education, healthcare, survival, reproductive choices, work, housing and child-raising costs can influence fertility and mortality. Do not treat economic development as a single automatic cause or assume every country follows an identical path.

Invented annual population account

Population structure

Population pyramids show population by age band and the recorded sex categories, commonly males left and females right. Young ages appear at the bottom. Read whether values are counts or percentages, the percentage denominator and band widths. The attached profiles are qualitative teaching schematics with no numerical scale, date or country identification.
A relatively broad base indicates numerous younger cohorts; a narrow base relative to adult groups can reflect fewer recent births. Births, deaths, migration and cohort history affect shape. Ageing means an increasing older-age share, not that the oldest band is necessarily widest. Do not infer a country’s income group from a profile alone.
With age groups 0–14 and 65+ compared with 15–64, total age dependency ratio = (younger + older) ÷ working-age × 100. For invented groups 30, 10 and 60, it is 66.7 per 100. Definitions vary; age does not tell us who works, needs support or provides unpaid care.
A youthful population can increase school and job demand; an older population can increase healthcare, care and pension demand. Education, health, participation, productivity and service funding affect outcomes. Recognise contributions at every age and avoid treating people as an inevitable burden.

Schematic age-sex profiles

Population policies

China’s one-child restrictions emerged around the late 1970s and 1980 and varied across groups, places and time. The universal two-child policy took effect in 2016 after a 2015 announcement; the government announced a three-child policy in 2021. This is a historical sequence, not a claim that these descriptions exhaust current policy.
Restrictions interacted with son preference and wider changes, contributing to imbalanced sex ratios in some cohorts and smaller younger cohorts. Ageing and fertility change also reflect urbanisation, education, costs, survival and preferences. The often-repeated 400-million-births figure is not used here: attributing hypothetical births to one policy requires a justified counterfactual.
The 4–2–1 phrase illustrates one adult child potentially supporting two parents and four grandparents, not a universal household arrangement. Pro-natalist policies seek to encourage births through measures such as childcare, parental leave or benefits. Judge outcomes with dated evidence and consider rights, wellbeing, affordability and unintended effects.

Historical China policy changes

Migration

Migration changes usual residence and can occur within or across national borders. Push factors make an origin less attractive or safe; pull factors attract people elsewhere. People’s freedom of choice varies, and simple voluntary/forced categories can conceal mixed circumstances.
A refugee is outside their country and needs protection from persecution or serious conflict-related danger. Internally displaced people have fled home while staying inside their country. Not every person displaced by a disaster or seeking work automatically meets the refugee category.
Origin communities may receive remittances and return skills, while losing particular workers or experiencing separation. Destinations may gain labour, businesses, cultural links and taxes while needing housing, schools and services. Impacts depend on policy, local capacity and the people concerned; they are not uniformly positive or negative.

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1.What is the crude birth rate?
Easy
- Abirths per 1000 people per year
- Bdeaths per 1000
- Cmigration per 1000
- Dpeople per km²
2.What is the crude death rate?
Easy
- Abirths per 1000
- Bmoves per 1000
- Cpeople per km²
- Ddeaths per 1000 people per year
3.How is natural population change calculated for a defined place and period?
Easy
- Amigration
- Bdensity
- Cbirths minus deaths
- Ddeaths minus births
4.What is net migration?
Easy
- Adensity
- Bimmigration minus emigration
- Cbirths minus deaths
- Ddeaths minus births
5.What does a population pyramid base that is broad relative to older age groups most directly indicate?
Easy
- Arelatively numerous younger age groups on the chart’s stated scale
- Blow birth rate
- Cageing
- Dno children
6.What is a dependency ratio?
Easy
- Abirth versus death
- Bdensity
- Cmigration rate
- Dselected younger and older age groups compared with a defined working-age group
7.Which combination can help explain high population density in some places?
Easy
- Amountains
- Bice
- Cfertile land and jobs
- Ddeserts
8.Which combination can help explain low population density in some places?
Easy
- Aservices
- Bharsh climate or difficult relief
- Cfertile soil
- Djobs

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9.What was China's one-child policy?
Easy
- Aa restrictive birth policy with rules and exemptions varying among places and groups
- Ba policy encouraging many children
- Ca tax
- Da ban on marriage
10.What was a negative effect of the one-child policy?
Easy
- Atoo many children
- Btoo many young
- Chigher birth rate
- Dan imbalanced sex ratio in some cohorts and smaller younger cohorts
11.What is a refugee?
Easy
- Aa student
- Ba commuter
- Csomeone outside their country who needs protection from persecution or serious conflict-related danger
- Da tourist
12.Which service demand can increase as a population’s older-age share grows?
Medium
- Atoo few elderly
- Bhealthcare, social care and pension provision
- Cpressure on schools
- Dtoo many births
13.Which planning challenge can a large youthful population create?
Medium
- Apressure on schools and jobs
- Bpressure on pensions only
- Clabour surplus only
- Dno problems
14.What is a pro-natalist policy?
Medium
- Aone limiting births
- Bone banning births
- Cone ignoring births
- Done encouraging more births
15.How can migration benefit a destination country?
Medium
- Aends jobs
- Bcreates no change
- Cprovides labour and skills
- Dreduces workers
16.What are remittances?
Medium
- Aloans
- Bmoney sent home by migrants
- Ctaxes
- Daid
17.Why might the birth rate fall as a country develops?
Medium
- Aeducation and contraception improve
- Bfewer people
- Cfewer hospitals
- Dfewer schools
18.Why might China have changed to a three-child policy?
Medium
- Ato reduce population
- Bto ban births
- Cto end migration
- Dto counter ageing and a falling workforce
19.Why is it hard to compare population density with quality of life?
Medium
- Ait is a map
- Bit is unrelated to area
- Cdensity does not show wealth or services
- Dit shows everything
20.How might emigration harm a country?
Medium
- Ano effect
- Bloss of young, skilled workers
- Cgain of workers
- Dmore services
21.What does a higher age dependency ratio directly indicate?
Medium
- Amore people in selected dependent-age groups per defined working-age person
- Bno effect
- Cmore workers
- Dmore tax
22.What is a 'youthful population'?
Easy
- Amany elderly
- Bno children
- Cno adults
- Done with a relatively large share of children or younger people
23.What is an 'ageing population'?
Easy
- Amany teens
- Bno old
- Cone in which the share of older people is increasing
- Dmany babies
24.What is the 4-2-1 problem in China?
Medium
- Ano children
- Bone adult child may face support for two parents and four grandparents
- Cfour children, two parents
- Done grandparent
25.What is forced migration?
Medium
- Apeople moved against their will, such as by war
- Bpeople choosing to move
- Ctourism
- Dstudy
26.Natural population change equals births minus deaths for the same place and period.
Easy
True or false?
27.A pyramid base broad relative to older groups indicates a relatively youthful age structure.
Easy
True or false?
28.China's one-child policy was introduced in 2016.
Easy
True or false?
29.Ageing populations can strain healthcare systems.
Easy
True or false?
30.Population density is the number of people in a country.
Medium
True or false?
31.Which are physical factors affecting distribution?
Medium
- Aclimate
- Brelief
- Csoil
- Dwater supply
- Ejobs
32.Which are possible pressures associated with an ageing population, depending on local conditions?
Medium
- Agreater healthcare and care demand
- Bpension-financing pressure
- Cshortages of particular workers
- Dschool closures guaranteed solely by a rising older-age share
- Ea guaranteed increase in births
33.Explain two demographic or family-support problems associated with China’s one-child policy, and state one limit on attributing them to the policy alone.
Medium
34.An invented district has 120,000 residents and area 300 km². What is its average population density?
Medium
35.In one invented year a town has 1,200 births, 800 deaths, 300 immigrants and 500 emigrants. What is the total population change in people?
Medium
36.An invented country has crude birth rate 18 per 1,000 and death rate 7 per 1,000 in one year. What is its natural increase rate per 1,000?
Medium
37.An invented population has 30 people aged 0–14, 60 aged 15–64 and 10 aged 65+. Using these age bands, how many dependent-age people are there per 100 working-age people? Give one decimal place.
Medium
38.A family flees conflict but remains inside its country. Which term describes that displacement?
Medium
- Ainternational immigration by definition
- Btourism
- Crefugee status automatically without crossing a border
- Dinternal displacement

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