AP Human Geography

Geography is the study of where things are and why they are there. Its most basic tool is the map 地图 — a flattened picture of some part of Earth's surface.

Maps come in two big families. A reference map 参考地图 shows fixed locations — coastlines, borders, roads, cities (a road atlas or Google Maps). A thematic map 专题地图 shows how one variable changes across space — rainfall, income, or population density. AP Human Geography uses thematic maps constantly.

Reference maps show location; thematic maps show how a variable varies over space

Because Earth is a sphere and a map is flat, every map uses a projection 投影 that stretches the globe onto paper. Projections always distort 扭曲 something — shape, area, distance, or direction. The famous Mercator projection keeps direction correct (useful for sailing) but makes high-latitude places like Greenland look far too large. There is no perfect projection; a cartographer chooses one that fits the map's purpose.

Geographic data 地理数据 is any information tied to a location. Geographers collect it in the field (counting, surveying, interviewing) and remotely with technology.

Key geospatial technologies 地理空间技术 you must know:

• GIS 地理信息系统 (Geographic Information System) — software that layers many kinds of spatial data so patterns can be compared.
• GPS (satellite navigation) — pinpoints exact location on Earth.
• Remote sensing 遥感 — gathers data from satellites or aircraft without touching the ground.

Data also comes from written sources: field observations, media reports, travel writing, policy documents, interviews, and photographs.

Data is powerful because it drives decisions. Businesses use it to choose store locations, governments use census data to plan schools and roads, and aid agencies use it to send help after a disaster.

But data is never neutral. Who collects it, which categories they use, and how a map is drawn can all shape the message. A map can inform — or it can mislead — so a good geographer always asks where the data came from and what it leaves out.

Geographers describe location and pattern with a precise vocabulary.

• Absolute location 绝对位置 is an exact address — latitude and longitude. Relative location 相对位置 describes a place by what is near it ("north of the river").
• Absolute distance is measured in kilometres; relative distance is measured in time, cost, or effort.
• Space–time compression 时空压缩 is the shrinking of the felt distance between places as transport and communication improve.
• Distance decay 距离衰减 means that interaction between two places weakens as the distance between them grows.

Points can be clustered, dispersed, or arranged along a line — the spatial pattern is itself data

A spatial pattern 空间格局 is how things are arranged: clustered 聚集 (bunched together), dispersed 分散 (spread apart), or linear (along a line such as a road). Reading the pattern is the first step in explaining why it exists.

People and the environment shape each other. Three older ideas describe this:

• Environmental determinism 环境决定论 — the (now rejected) claim that the physical environment determines how a culture develops.
• Possibilism 可能论 — the accepted view that the environment sets limits, but people choose how to respond using technology and culture.

The cultural landscape 文化景观 — farms, cities, and roads built on the land — is the visible result of this interaction. Sustainability asks how people can use natural resources without using them up.

Scale of analysis 分析尺度 is the level at which you look at data — global, regional, national, or local. The same pattern can look completely different at different scales.

The same place nests inside larger and larger scales — the scale you choose changes the pattern you see

For example, a country may look wealthy at the national scale, yet contain very poor neighbourhoods at the local scale. Zooming in or out — changing the scale — reveals patterns that were hidden before. Exam questions often ask you to explain a process "at various scales."

A region 区域 is an area with one or more shared features that make it different from surrounding areas. Geographers use three types:

• Formal (uniform) region 正式区域 — everyone shares a measurable trait (a country, a wheat-growing belt, a language area).
• Functional (nodal) region 功能区域 — organised around a central node, like a city and its commuter zone or a pizza shop's delivery area.
• Perceptual (vernacular) region 感知区域 — defined by people's feelings and beliefs, with fuzzy borders (the "American South", the "Middle East").

Regions are made by geographers, not found in nature — so their borders can be argued about, which is exactly why they are useful for analysis.

• Always name a map projection's trade-off: what it preserves versus distorts (Mercator keeps direction but exaggerates area).
• State whether data is quantitative or qualitative, and match a source (GIS, GPS, remote sensing, census) to its use.
• Distinguish absolute from relative location, and use distance decay and time-space compression in any flow answer.
• Mind the scale of analysis: a national average hides local variation — say so explicitly.
• Classify every region as formal, functional, or perceptual, and justify it by the defining trait.

People are spread very unevenly across Earth. Population distribution 人口分布 describes where people live; population density 人口密度 measures how crowded a place is. Most people cluster in a few favourable places: mid-latitudes, low-lying land, coasts, and river valleys with water and fertile soil.

Geographers use three density measures:

• Arithmetic density 算术密度 — total people ÷ total land area.
• Physiological density 生理密度 — people ÷ area of arable (farmable) land; a better guide to pressure on food supply.
• Agricultural density 农业密度 — farmers ÷ arable land; a low value suggests more efficient, mechanised farming.

Uneven distribution creates consequences: crowded regions strain housing, water, and services, while empty regions may struggle to provide roads and schools.

Population composition 人口构成 is the make-up of a population by age and sex. It is shown on a population pyramid 人口金字塔 — back-to-back bar charts of males and females in five-year age cohorts 年龄组.

A wide base means rapid growth; straight sides mean slow growth; a narrow base means decline

• A wide base means high birth rates and rapid growth (many young people).
• Straight sides mean slow, stable growth.
• A narrow base with a wide middle means an aging, shrinking population.

The dependency ratio 抚养比 compares dependents (under 15 and over 64) to the working-age population — a high ratio strains the workers who support them.

Populations change through births, deaths, and migration. Key rates (per 1,000 people per year):

• Crude birth rate (CBR) 粗出生率 and crude death rate (CDR) 粗死亡率.
• Rate of natural increase (RNI) 自然增长率 = (CBR − CDR) ÷ 10, as a percentage — it ignores migration.
• Total fertility rate (TFR) 总和生育率 — average children per woman; about 2.1 is replacement level 更替水平.

The doubling time 倍增时间 (years for a population to double) ≈ 70 ÷ RNI%. Small changes in fertility have huge long-run effects.

The Demographic Transition Model (DTM) 人口转变模型 shows how birth and death rates change as a country develops, through five stages.

Death rate falls first, then birth rate; the gap between them is the population boom

1. Stage 1 — high, fluctuating CBR and CDR; slow growth (pre-industrial).
2. Stage 2 — CDR falls (better food, medicine, sanitation) while CBR stays high; population booms.
3. Stage 3 — CBR falls (urbanisation, education, women in work); growth slows.
4. Stage 4 — low CBR and CDR; population stable and large.
5. Stage 5 — CBR falls below CDR; population declines and ages.

The linked epidemiological transition 流行病学转变 describes how the main causes of death shift from infectious disease to chronic, degenerative disease as a country moves through the DTM.

In 1798 Thomas Malthus argued that population grows exponentially 指数式 while food supply grows only linearly 线性, so population would outrun food and be checked by famine, disease, and war.

Critics say Malthus underestimated technology: the Green Revolution and modern farming raised food output enormously. Neo-Malthusians 新马尔萨斯主义者 update the worry to include water, energy, and other finite resources. The debate is a favourite exam prompt.

Governments try to influence population growth with policies:

• Pro-natalist 鼓励生育 policies encourage births (cash bonuses, parental leave, childcare) where populations are aging or shrinking — e.g. France, Japan.
• Anti-natalist 限制生育 policies discourage births where growth is seen as too fast — e.g. India's family-planning campaigns.

Policies have unintended consequences: strong anti-natal policies can skew the sex ratio or speed up aging, which later needs a pro-natal response.

The status of women is one of the strongest drivers of fertility. As female education and employment rise, women marry later and have fewer children, so fertility falls — a key reason countries move through the DTM.

At the other end, aging populations 人口老龄化 (a rising share of over-65s) bring their own challenges: higher pension and healthcare costs, a shrinking workforce, and a rising dependency ratio. Countries respond with later retirement, immigration, or pro-natal policies.

Migration 迁移 is a permanent move to a new location. It is driven by push factors 推力 (reasons to leave: war, poverty, disaster) and pull factors 拉力 (reasons to arrive: jobs, safety, family).

Migration decisions weigh push factors against pull factors, across an intervening obstacle

• Voluntary migration 自愿迁移 is by choice, usually for economic reasons.
• Forced migration 强迫迁移 is against a person's will — refugees 难民 fleeing danger, or people displaced by disaster.
• Ravenstein's laws describe patterns: most migrants move short distances, in steps, and are drawn mainly by economic pull.

Migration can be international (between countries) or internal (within a country, such as rural-to-urban).

Migration reshapes both the origin and the destination.

• The destination gains workers and cultural diversity but may face pressure on housing and services and social tension.
• The origin may lose skilled workers (a brain drain 人才外流) but gain remittances 侨汇 — money migrants send home, a major income source for many countries.
• Migration changes the age and sex structure of both places, because migrants are often young working-age adults.

• Compute RNI = (CBR − CDR) ÷ 10 as a percent, and read doubling time as about 70 ÷ RNI.
• Link a population pyramid's shape to fertility and the DTM stage — a wide base means Stage 2.
• Remember the death rate falls before the birth rate; that is why Stage 2 grows fastest.
• Separate push from pull and forced from voluntary; a refugee crosses a border, an IDP does not.
• Weigh migration effects: remittances help the origin, but brain drain and aging hurt it.

Culture 文化 is the shared set of beliefs, values, practices, and objects of a group of people. Geographers split it into two parts:

• Material culture 物质文化 — the things people make and use (clothing, tools, food, buildings, art).
• Nonmaterial culture 非物质文化 — the ideas people hold (language, religion, values, rules).

A cultural trait 文化特征 is a single element of culture (using chopsticks); a group of linked traits is a cultural complex. Cultural relativism 文化相对论 is the practice of judging a culture by its own standards rather than your own.

The cultural landscape 文化景观 is the visible imprint of human activity on the land — buildings, farms, roads, signs, and monuments. It records the values of the people who made it.

• Sequent occupance 承继占用 is the idea that each group who lives in a place leaves a layer on the landscape, so the landscape shows its whole history.
• Ethnic enclaves 族裔聚居区, religious buildings, and language on signs are all readable clues to who lives there and what they value.

Cultures spread across space in patterns. Key ideas:

• Centripetal forces 向心力 pull a group together (a shared language or religion); centrifugal forces 离心力 push it apart.
• Acculturation 文化适应 (adopting some traits of another culture while keeping your own), assimilation 同化 (fully blending into another culture), and syncretism 融合 (two cultures blending into something new) describe how cultures change on contact.
• A lingua franca 通用语 is a common language used between groups who speak different first languages.

Diffusion 扩散 is the spread of a cultural trait from its hearth 源地 (place of origin) to new areas. There are two big families.

Relocation diffusion moves with migrants; expansion diffusion spreads outward while staying at the source

• Relocation diffusion 迁移扩散 — the trait moves as people migrate, so it appears in the new place but may fade at the source.
• Expansion diffusion 扩展扩散 — the trait spreads outward while staying strong at the source. It has three types:
  • Contagious 传染扩散 — spreads person-to-person to nearby people (like a viral video).
  • Hierarchical 等级扩散 — jumps from big, important places to other big places first (a fashion from major cities).
  • Stimulus 刺激扩散 — the underlying idea spreads even if the exact trait changes (a global brand adapting its menu locally).

Diffusion has both historical and contemporary causes.

• Historical: colonialism 殖民主义, imperialism 帝国主义, trade, and the spread of religion carried culture across the world for centuries.
• Contemporary: globalisation 全球化, the internet, transport, and time–space compression speed diffusion up enormously — a trend can now spread worldwide in hours.

These forces can spread culture but also threaten local traditions, raising debates about a global culture versus local identity.

Religions and languages are the two clearest examples of cultural diffusion.

• Universalising religions 普世宗教 (Christianity, Islam, Buddhism) actively seek converts and spread widely by expansion and relocation diffusion. Ethnic religions 民族宗教 (Hinduism, Judaism) are tied to one group and spread mainly by relocation.
• Languages belong to language families 语系; they spread with migration and trade, and can split into dialects 方言 or die out as speakers switch to a dominant language.

When cultures spread and meet, several outcomes follow:

• Cultural convergence 文化趋同 — cultures become more alike as they share traits (global brands, English online).
• Cultural divergence 文化分化 — a culture becomes more distinct, often to resist outside influence.
• Diffusion can enrich a place with new food, music, and ideas, but can also erode local languages and traditions — a central tension of a globalising world.

• Distinguish relocation diffusion (people move) from expansion diffusion (the idea spreads and stays at its source).
• Name the expansion sub-type precisely: contagious, hierarchical, or stimulus.
• Separate universalizing religions (seek converts) from ethnic religions (spread mainly by birth).
• Use the cultural landscape — architecture, toponyms, sequent occupance — as evidence of past groups.
• For effects, keep acculturation, assimilation, and syncretism distinct; they are not the same.

Political geography 政治地理学 studies how humans divide and control space. Its key units:

• A state 国家 (country) is an area with defined borders, a permanent population, a government, and sovereignty 主权 — full control over its own affairs.
• A nation 民族 is a group of people with a shared culture and identity; a nation-state 民族国家 is a state whose borders match one nation (Japan is close).
• A multinational state 多民族国家 contains several nations; a stateless nation 无国家民族 (like the Kurds) has no state of its own.

Territoriality 领域性 is the attempt by a person or group to control people and things by controlling an area. Power is expressed geographically through control of land, people, and resources.

• Colonialism and imperialism built empires by taking control of distant territory; neocolonialism 新殖民主义 is continued economic control after formal independence.
• Choke points 咽喉要道 (narrow straits like Suez or Malacca) and shatterbelts 破碎地带 (regions caught between competing powers) show how geography shapes political power.

A boundary 边界 is a line that marks the limit of a state's territory. Types by origin:

States take different shapes; each shape affects how easily the state can be governed

• Antecedent 先成边界 (drawn before dense settlement), subsequent 后成边界 (drawn as cultures develop), superimposed 叠加边界 (forced on by an outside power, ignoring local culture), and relic 残余边界 (no longer a border but still visible, like the Berlin Wall).
• Definition, delimitation, and demarcation are the steps of setting a boundary: agreeing wording, drawing it on a map, then marking it on the ground.
• The shape of a state matters: compact states are easy to govern; elongated, fragmented, perforated, and prorupted shapes create governing challenges.

States organise power between the centre and the regions in two main ways:

A unitary state keeps power central; a federal state shares power with regional governments

• A unitary state 单一制国家 keeps most power in the central government (France). It works best in small or culturally uniform countries.
• A federal state 联邦制国家 shares power between the centre and regional governments (USA, India). It suits large or diverse countries.
• Gerrymandering 选区划分不公 is redrawing voting district boundaries to favour one group — a political use of geography.

Devolution 权力下放 is the transfer of power from a central government down to regional governments. It is driven by devolutionary factors: ethnic or religious differences, physical geography (islands, mountains), and economic inequality.

• Strong differences can lead to autonomy 自治 for a region, or even a movement for full independence.
• Sovereignty is also challenged from outside by supranational organisations 超国家组织 (the EU, UN), by globalisation, and by the internet, which crosses borders freely.

Two opposing forces act on every state:

• Centrifugal forces 离心力 pull a state apart — ethnic conflict, uneven development, and weak identity can lead to failed states 失败国家 and separatist movements.
• Centripetal forces 向心力 hold a state together — a shared language, national symbols, fair infrastructure, and a strong national identity (ethnonationalism 族裔民族主义 when tied to one ethnic group).

Governments strengthen centripetal forces (national holidays, a common language) to keep the state unified. Balancing these forces is the central task of political geography.

• Keep state (territory + sovereignty), nation (a people), and nation-state clearly separate.
• Classify a boundary by history (antecedent / subsequent / superimposed / relict) and by stage (defined to administered).
• Name the boundary-dispute type: definitional, locational, operational, or allocational.
• Compare unitary and federal governance, and link the choice to managing diversity.
• Explain instability through centrifugal and centripetal forces and devolution; use neutral examples.

Agriculture 农业 is the deliberate growing of crops and raising of animals for food and other products. A first big split:

• Subsistence agriculture 自给农业 — farming to feed the farmer's own family, common in less-developed regions.
• Commercial agriculture 商业农业 — farming to sell for profit, common in developed regions and often large-scale and mechanised.

Farming also varies by intensity: intensive 集约 farming uses a lot of labour or money on a small area (rice paddies, market gardening); extensive 粗放 farming uses little input over a large area (ranching, shifting cultivation).

How farmers settle the land leaves a lasting pattern.

• Clustered (nucleated) 集聚式 settlements group homes together; dispersed 分散 settlements spread them out; linear settlements follow a road or river.
• Survey methods divide the land: the metes-and-bounds system uses natural features; the township-and-range system uses a grid of squares; the long-lot system gives each farm a thin strip reaching a river or road.

Farming began in a few hearths and spread by diffusion, then was transformed by three revolutions.

• The First (Neolithic) Agricultural Revolution 新石器农业革命 was the original domestication of plants and animals, letting people settle in one place.
• The Second Agricultural Revolution 第二次农业革命 used the tools of the Industrial Revolution (machines, better transport, crop rotation) to raise output and feed growing cities.
• The Green Revolution 绿色革命 (mid-1900s) introduced high-yield seeds, fertilisers, pesticides, and irrigation — hugely increasing food output, though at an environmental and social cost.

The type of farming in a place depends on climate and level of development.

• Tropical regions favour shifting cultivation 迁移农业 (slash-and-burn) and plantation crops; dry regions favour pastoral nomadism 游牧 (herding).
• Developed regions have mixed crop and livestock, dairying, and large commercial grain farms.
• Bid-rent theory 竞租理论 explains why land close to a market is used more intensively: it is more expensive, so it must earn more per hectare.

The von Thünen model 冯·杜能模型 (1826) explains what farmers grow where, based on transport cost and distance to market.

Perishable, heavy, or intensive products locate near the market; extensive uses locate farther out

• At the centre is the market (a city). Around it, land use forms concentric rings.
• Ring 1 — market gardening and dairying (perishable, must be near market).
• Ring 2 — forest (heavy firewood, costly to move, in his day).
• Ring 3 — field crops and grain (less perishable).
• Ring 4 — ranching (extensive, low value per hectare, can be far away).

The model assumes a flat, uniform plain with one market. Real regions bend the rings because of roads, rivers, terrain, and refrigeration — but the core idea, that transport cost shapes land use, still holds.

Modern farming is a global supply chain 全球供应链.

• Agribusiness 农业综合企业 links farms to seed, machinery, processing, and retail companies.
• Many countries specialise in a few export commodities 出口商品 (coffee, cocoa, soy), which can make them dependent on world prices.
• Fair trade 公平贸易 and local-food movements are responses to the inequalities of this global system.

Modern agriculture feeds billions but creates problems:

• Environmental: soil erosion, water pollution from fertiliser, loss of biodiversity, desertification 荒漠化, and greenhouse-gas emissions.
• Economic and social: the loss of small family farms, rural depopulation, and questions about food security 粮食安全 and GMOs 转基因生物.
• Land use change: suburbanisation and urban growth eat into farmland at the edge of cities.

In much of the developing world, women do the majority of farm labour, especially in subsistence agriculture, yet often own little of the land. Their role is central to family food supply. Improving women's access to land, credit, and education raises farm output and, by lowering fertility, links back to the demographic transition.

• Classify farming on two axes at once: subsistence or commercial, and intensive or extensive.
• Drive every Von Thünen answer with transport cost and the perishability of the product.
• Weigh the Green Revolution: higher yields against costly inputs, environmental harm, and uneven reach.
• Name the survey system (long-lot, township-and-range, metes-and-bounds) from the field shape.
• Connect farming to its consequences: soil degradation, water pollution, and deforestation.

Urbanization 城市化 is the growth in the share of people living in cities. It began with the agricultural surplus that freed some people from farming, and accelerated with the Industrial Revolution.

• Urbanization rate rises fastest in developing countries today, driven by rural-to-urban migration.
• A suburb 郊区 is a residential area on the edge of a city; suburbanization 郊区化 and sprawl 城市蔓延 spread cities outward.
• Site 地点 (the physical features of a place) and situation 区位 (its location relative to other places) explain why a city grew where it did.

Some cities have influence far beyond their own country.

• World cities 世界城市 (also called global cities) — such as New York, London, and Tokyo — are command centres of the global economy, finance, and culture.
• Globalization links cities into networks; a decision in one world city can affect jobs on the other side of the planet.

Cities within a country follow patterns of size and spacing.

• The rank-size rule 位序规模法则 says the nth-largest city is 1/n the size of the largest (the 2nd city is half the largest, the 3rd a third, and so on).
• A primate city 首位城市 is far larger than all others (Paris, Bangkok), dominating its country.
• Central place theory 中心地理论 (Christaller) explains the spacing of settlements: larger centres are fewer and farther apart and offer higher-order goods; their market area is the surrounding region they serve.

Three classic models describe how North American cities are arranged inside.

The concentric-zone, sector, and multiple-nuclei models each explain city land use differently

• Concentric zone model 同心圆模型 (Burgess) — rings around the Central Business District (CBD) 中央商务区, from inner-city to commuter suburbs.
• Sector model 扇形模型 (Hoyt) — land use grows outward in wedges along transport routes.
• Multiple nuclei model 多核心模型 (Harris–Ullman) — the city has several centres (nodes), not just one CBD, as it grows and specialises.

Developing-world cities have their own models (e.g. the Latin American, or Griffin–Ford, model with a spine of wealth from the centre).

Inside the city, land use and density change from centre to edge.

• Density is highest near the CBD (tall buildings, high land prices) and falls outward — the bid-rent curve again.
• Zoning 分区规划 laws separate land uses (residential, commercial, industrial).
• Infrastructure 基础设施 — roads, water, power, transit — must grow with the city; where it lags, informal settlements 非正规住区 (slums) may form.

Planners use data and design to make cities work better.

• Smart-growth 精明增长, mixed-use development, and transit-oriented design fight sprawl and car dependence.
• Greenbelts 绿带 limit outward growth; urban renewal 城市更新 rebuilds decayed areas, but can cause gentrification 中产阶级化 that displaces poorer residents.
• Census and geospatial data guide where to put schools, transit, and services.

Rapid urban growth brings problems:

• Social: housing shortages, segregation, and the displacement caused by gentrification.
• Environmental: air and water pollution, the urban heat island 城市热岛 effect, waste, and heavy resource use.
• Economic: strained budgets, congestion, and the cost of extending infrastructure to sprawling edges.

Sustainable cities try to grow up rather than out, invest in public transit, and mix homes with jobs and services.

• Separate a city's site (physical setting) from its situation (position relative to others).
• Apply the rank-size rule (the nth city is about 1/n of the largest) and spot a primate city.
• Match a city description to the right model: concentric zone, sector, or multiple nuclei.
• Link land value to density — costly central land is used by building upward.
• Discuss change with suburbanization, sprawl, and gentrification, and smart-growth responses.

The Industrial Revolution 工业革命 (from the 1700s) shifted production from hand tools in homes to machines in factories, first in Britain and then worldwide. It transformed geography:

• Industry clustered where resources (coal, iron) and transport (rivers, ports, railways) came together.
• It powered urbanization as workers moved to factory cities, and it began the huge, uneven spread of wealth between world regions.
• Break-of-bulk points 转运点 (ports, rail hubs where cargo changes transport) became key industrial locations.

An economy's jobs fall into sectors, and the mix shifts as a country develops.

As development rises, workers move from primary (farming) to secondary (industry) to tertiary and quaternary (services)

• Primary sector 第一产业 — extracting raw materials (farming, mining, fishing).
• Secondary sector 第二产业 — manufacturing raw materials into goods.
• Tertiary sector 第三产业 — services (retail, transport, healthcare).
• Quaternary 第四产业 and quinary sectors — information, research, and top decision-making.

Poorer economies lean on the primary sector; richer ones on the tertiary and quaternary. Weber's least-cost theory 韦伯最小成本理论 explains where factories locate, balancing the cost of transport, labour, and agglomeration.

Development 发展 is the process of improving people's economic and social well-being. It is measured in several ways:

• Gross Domestic Product (GDP) per capita 人均国内生产总值 — economic output per person; a common but incomplete measure.
• The Human Development Index (HDI) 人类发展指数 combines income, education (years of schooling), and health (life expectancy) into one score from 0 to 1 — a fuller picture than money alone.
• The Gender Inequality Index (GII) 性别不平等指数 and the Gini coefficient 基尼系数 (income inequality) add social detail.

The role of women is both a cause and a measure of development.

• As economies develop, more women enter paid work and education, which raises household income and lowers fertility (linking back to the demographic transition).
• Microfinance 小额信贷 — small loans, often to women — helps start businesses in poorer regions.
• Gender gaps in pay, land ownership, and schooling hold development back; closing them is one of the UN's key goals.

Two famous theories explain why some regions are rich and others poor.

Rostow sees development as a climb through five stages; critics say it ignores global inequalities

• Rostow's stages of growth 罗斯托发展阶段 — every country climbs through five stages: traditional society, preconditions for take-off, take-off, drive to maturity, and age of mass consumption. It is optimistic but assumes all countries can follow the same path.
• Wallerstein's world-systems theory 沃勒斯坦世界体系理论 divides the world into a wealthy core 核心, a poorer periphery 边缘, and a middle semi-periphery 半边缘. The core stays rich partly by using the periphery's cheap labour and resources — a dependency 依附 view that challenges Rostow.

Countries are linked by trade, which reshapes development.

• Comparative advantage 比较优势 means each country gains by specialising in what it makes most efficiently and trading for the rest.
• Complementarity and neoliberal free-trade policies, plus organisations like the WTO and trade blocs (EU, USMCA), have deepened globalization.
• Outsourcing 外包 and global supply chains move manufacturing to lower-cost countries, changing where — and by whom — the world's goods are made. Special economic zones 经济特区 attract this investment with tax breaks.

Sustainable development 可持续发展 meets present needs without harming the ability of future generations to meet theirs.

• It tries to balance economic growth, social fairness, and environmental protection — the "three pillars".
• Ecotourism 生态旅游 and small-scale, renewable projects can develop an economy while protecting the environment.
• The UN's Sustainable Development Goals (SDGs) 可持续发展目标 set shared targets for poverty, health, education, and climate — a common way to measure progress today.

• Classify jobs by sector (primary through quinary) and tie the mix to the development level.
• Prefer the HDI over GDP per capita — it adds education and life expectancy.
• Contrast Rostow's stages with world-systems (core and periphery) and dependency theory.
• Use comparative advantage and the effect of tariffs in any trade answer.
• Bring in sustainable development and the ecological footprint for evaluation marks.