4.7
Sustainable development
What sustainable development means, what the Sustainable Development Goals are and how they interrelate, and (HL) how poverty and environmental damage reinforce each other.
Level and scope checked against the Economics guide (course first assessed 2022; October 2022 update), pp. 20–21, 51, on 11 Nov 2026. AI-assisted check, not reviewed by a teacher.
Contents
- 1Learning objectives and review status
- 2HL learning objectivesHL
- 3What sustainable development means
- 4The Sustainable Development Goals
- 5HL: the relationship between sustainability and povertyHL
- 6Common mistakes and exam application
- 7Practice and feedback: 10 marks
- 8Practice and feedback: 10 marksHL
- 9Practice and feedback: 2 marks
- 10Practice and feedback: 4 marks
- 11Practice and feedback: 4 marksHL
- 12Sources and review status
1Learning objectives and review status
- Explain the meaning of sustainable development and distinguish it from economic growth and from economic development.
- Explain why markets can leave future generations with less, using externalities and common pool resources.
- Describe the Sustainable Development Goals: who adopted them, when, for what purpose, and how progress on one goal can help or hinder another.
2HL learning objectivesHL only
- Explain how poverty can lead to unsustainable resource use and how environmental degradation can deepen poverty.
3What sustainable development means
is development that meets the needs of the present without compromising the ability of future generations to meet their own needs. The wording comes from the report of the United Nations' Brundtland Commission in 1987, and the United Nations still uses it. is the property the definition turns on: a pattern of production and consumption is sustainable if it can continue without reducing what later generations will be able to do.
The definition has two parts, and both carry weight. 'The needs of the present' means that development is still the aim: people who lack food, health care, schooling or work have needs that are not being met. 'Without compromising future generations' sets a limit on how those needs are met: the present generation may not pay for its own progress by using up what the next one will depend on.
The United Nations describes sustainable development as having three elements, which are usually called its economic, social and environmental dimensions. They have to be achieved together. Higher output bought by destroying forests fails the environmental dimension; a protected environment beside mass poverty fails the economic and social dimensions; and growth whose gains reach only a few fails the social dimension.
| Dimension | What it requires | A sign that development is not sustainable |
|---|---|---|
| Economic | Rising incomes, employment and productive capacity | Output that depends on running down resources or on debt that cannot be repaid |
| Social | Health, education, equity and inclusion, so that gains are widely shared | Persistent poverty, or groups shut out of schooling, health care and work |
| Environmental | Natural systems and resources kept able to support production and life | Resources used faster than they regenerate; pollution emitted faster than it is absorbed |
Three terms need to be kept apart. is an increase in real GDP over time. is wider: a broad improvement in living standards, with lower poverty, better health and education and more choice. Sustainable development adds a condition about time: the improvement must be one that can last and that leaves future generations no worse placed. Growth can help to pay for development, but an economy can grow without developing, and it can develop in a way that cannot be sustained.
Development may fail to be sustainable because production draws on : forests, fish stocks, soils, fresh water, minerals and a stable climate. If a renewable resource is used faster than it regenerates, or waste is emitted faster than the environment can absorb it, the stock falls. A smaller stock supports less production later, so output gained today is paid for by lower production possibilities in the future. On a production possibilities curve this is growth now followed by a curve that shifts outward more slowly, or shifts inward.
Markets allow this to happen for two reasons taught in microeconomics. The first is the . A firm that pollutes pays its private costs and not the cost that the pollution imposes on third parties. Because the price leaves that cost out, more of the good is produced and consumed than is socially optimal. Greenhouse gas emissions are the clearest case: the third parties include people in other countries and people not yet born.
The second reason is the . Fisheries, forests, grazing land and the atmosphere are rivalrous, since one user's take leaves less for others, and it is hard to exclude anyone from them. Each user receives the whole benefit of taking more and bears only a share of the cost of depletion, so every user has an incentive to take more than the stock can replace. Without rules or enforceable rights the resource is overused and may collapse.
Both failures have the same root in time. Future generations cannot bid in today's markets or vote in today's elections, so their interests carry too little weight in present decisions. , fairness between generations, is the form of that sustainable development adds to economics. The social dimension matters for a similar reason within one generation: development that leaves large groups poor or excluded wastes their human capital and weakens the stability on which future progress depends.
Check your understanding
Check your understanding
Key terms
- Sustainable development
- Development that meets present needs without undermining the ability of future generations to meet theirs.
- Sustainability
- Meeting present needs without compromising the ability of future generations to meet their own needs.
- Economic development
- A broad and lasting improvement in living standards, including lower poverty, better health and education and wider economic choice.
- Natural capital
- The stock of natural resources and environmental systems, such as forests, soils, fish stocks, fresh water and a stable climate, that supports production and well-being.
- Intergenerational equity
- Fairness between present and future generations in the use of resources and in the state of the environment that is passed on.
4The Sustainable Development Goals
The are 17 goals set out in the 2030 Agenda for Sustainable Development, which all United Nations member states adopted in 2015. The name of the agenda gives the horizon: the goals are to be reached by 2030.
The goals turn the definition of sustainable development into an agreed list of outcomes. Each goal is broken down into targets, and progress on the targets is tracked with statistics, so the goals give governments, international organisations and voters a common yardstick for what development should achieve. Because every member state adopted them, they apply to high-income countries as well as low-income ones: ending poverty is a goal, and so are responsible consumption and climate action. They are commitments that governments have made and report on, not laws that a court can enforce.
| Goal | Short title | Dimension it mainly serves |
|---|---|---|
| 1 | No poverty | Social and economic |
| 2 | Zero hunger | Social |
| 3 | Good health and well-being | Social |
| 4 | Quality education | Social |
| 5 | Gender equality | Social |
| 6 | Clean water and sanitation | Social and environmental |
| 7 | Affordable and clean energy | Economic and environmental |
| 8 | Decent work and economic growth | Economic |
| 9 | Industry, innovation and infrastructure | Economic |
| 10 | Reduced inequalities | Social |
| 11 | Sustainable cities and communities | Social and environmental |
| 12 | Responsible consumption and production | Economic and environmental |
| 13 | Climate action | Environmental |
| 14 | Life below water | Environmental |
| 15 | Life on land | Environmental |
| 16 | Peace, justice and strong institutions | Social |
| 17 | Partnerships for the goals | The means of reaching the others |
The goals and their titles are the United Nations'. The grouping by dimension is IB Vault's own aid to memory; the United Nations describes the goals as interconnected.
The goals are interconnected: progress on one changes how easy it is to reach another. Some goals support each other. Better education (Goal 4) raises earnings, which reduces poverty (Goal 1); educated parents know more about nutrition and hygiene and use health services more, which improves health (Goal 3); and schooling for girls widens women's choices in work and family life (Goal 5). Clean energy (Goal 7) replaces smoky cooking fuels, which improves health, and cuts emissions (Goal 13).
Other goals can pull against each other. Faster growth and industrialisation (Goals 8 and 9) raise incomes and employment, but if the extra output is produced with fossil fuels or on cleared land, emissions rise and habitats are lost, which sets back climate action (Goal 13) and life on land (Goal 15). Feeding more people (Goal 2) by extending farmland has the same effect on forests. The conflict is not fixed: it arises when growth relies on polluting energy and on using more land, and it shrinks when growth comes from cleaner technology and higher yields.
These links matter because resources are scarce. A government cannot fund every target at once, so spending on one goal has an opportunity cost in others. The interconnections show where that cost is lowest: an investment that advances several goals together, such as girls' education or clean energy, yields more development per unit of spending than one that advances a single goal at the expense of another.
- Breadth: seventeen goals, each with several targets, make it hard to decide what comes first, and a government can point to progress on some while neglecting others.
- Data: a target can be tracked only where the statistics exist, and the United Nations' 2026 report could assess trends for 139 targets. Statistical offices in low-income countries have the fewest resources.
- Finance: reaching the goals needs investment far beyond the public budgets of low-income countries. The United Nations puts the financing gap at about US$4 trillion per year.
- No enforcement: a government that misses a goal faces criticism, not a penalty, so progress depends on domestic priorities and on external shocks.
Check your understanding
Key terms
- Sustainable Development Goals (SDGs)
- The 17 goals of the 2030 Agenda for Sustainable Development, adopted by all United Nations member states in 2015, covering poverty, health, education, inequality, growth and the environment.
- Equity
- Fairness in the distribution of income, wealth, opportunities and economic outcomes, judged against a stated criterion.
5HL: the relationship between sustainability and povertyHL only
The United Nations treats the eradication of poverty as an indispensable requirement of sustainable development. The reason is that poverty and environmental damage cause each other. can push households into using resources unsustainably, and a degraded environment makes poor households poorer. The relationship has to be explained in both directions.
From poverty to unsustainable resource use. A household close to subsistence must secure food and fuel today, so benefits that arrive years later count for little in its decisions. It uses the resources that are free and at hand: it clears forest for farmland, farms steep or marginal land without leaving it fallow, grazes more animals than the pasture can carry and takes more fish than the stock can replace. Each choice is rational for the household and each runs down natural capital: soils erode, forests shrink, and yields and catches fall.
Lack of alternatives strengthens the link. Households that cannot afford electricity or gas burn wood, charcoal and dung. Farmers without savings or credit cannot buy better seed, fertiliser or irrigation that would raise yields on land already farmed. Farmers without secure rights to their land have little incentive to terrace it or plant trees, because the cost comes now and the return may go to someone else. Settlements without sanitation or waste collection pollute the water they depend on.
From environmental degradation to deeper poverty. Poor households depend directly on for their living, as subsistence farmers, herders and fishers, so they are the first to lose when it is degraded: lower yields mean less food and less income. Their health suffers too: smoke from solid fuels, unsafe water and poor sanitation cause disease, which costs working days and medical expenses and keeps children out of school, so productivity and future income fall. And they are the most exposed to shocks: poor households often live on the land most at risk of flood, drought or landslide, with no insurance or savings, so one bad season can destroy their assets.
Together the two directions form a cycle: low income leads to overuse of land, forests and fisheries; overuse lowers the productivity of those resources and damages health; lower productivity and poorer health keep income low. This is a with an environmental link. It can be drawn as a poverty cycle, the diagram taught with barriers to development (topic 4.9), with 'degraded natural capital' as one of the boxes.
- The link from poverty to degradation is strongest where rights over land, forests and fishing grounds are insecure, because nobody who conserves the resource can be sure of receiving the benefit, and where households have no affordable alternative fuel or source of income.
- The link from degradation to poverty is strongest where livelihoods are concentrated in farming, herding and fishing, because income then depends directly on the resource, and where public health services, insurance and savings are weak, because households cannot absorb a shock.
- Policies that act on both sides at once break the cycle at more than one point: access to clean energy and clean cooking, secure land and resource rights, sanitation and clean water, and payments to landowners who conserve forest, as in Costa Rica's Payment for Environmental Services programme.
Check your understanding
Key terms
- Absolute poverty
- A condition in which income or consumption falls below a fixed subsistence or international threshold.
- Poverty trap
- A self-reinforcing cycle in which poverty causes conditions, such as low saving, poor health and little education, that keep people or countries poor.
- Natural capital
- The stock of natural resources and environmental systems, such as forests, soils, fish stocks, fresh water and a stable climate, that supports production and well-being.
6Common mistakes and exam application
7Practice and feedback: 10 marks
8Practice and feedback: 10 marksHL only
9Practice and feedback: 2 marks
11Practice and feedback: 4 marksHL only
12Sources and review status
Written with AI assistance. The sources below were consulted on ; each entry says what it was used for and what it does not cover. Not reviewed by a teacher. Not approved as a finished revision resource.
Not yet checked against any source: HL: the two-way relationship between sustainability and poverty (section hl-sustainability-poverty), apart from the United Nations' statement that eradicating poverty is a requirement of sustainable development; that the Sustainable Development Goals are voluntary commitments and not binding law; the grouping of the goals by dimension, and the examples of goals that support or conflict with each other (IB Vault's own reasoning; the United Nations page states only that the goals are interconnected); natural capital and intergenerational equity as named terms.
Sources consulted
Diploma Programme Economics guide (course first assessed 2022; October 2022 update; cover reads "First assessment 2024")
International Baccalaureate. IB curriculum document, learner's own copy, 10 Nov 2026. Printed pp. 20-21 (syllabus outline) and the topic tables on the printed pages recorded on each syllabus node; assessment outline pp. 60-65; command terms pp. 74-75. PDF page = printed page + 6.
Used for: Topic titles, the scope of each topic and SL/HL level, the assessment format and the command terms, as recorded on each syllabus node.
Limits: Read from the learner's own PDF, which is not redistributed. The IB's online copy could not be opened by automated access (HTTP 403 on 11 November 2026), so this copy was not compared with it. It sets what must be taught; it does not explain the economics. AI-assisted reading, not checked by a teacher.
The Sustainable Development Agenda
United Nations. Real-world source, read in full, 11 Nov 2026. Section defining sustainable development
Used for: Sustainable development defined as development that meets the needs of the present without compromising the ability of future generations to meet their own; three core elements (economic growth, social inclusion, environmental protection); eradicating poverty stated as an indispensable requirement.
Limits: Does not attribute the definition to the 1987 Brundtland report (see un-sustainability). A statement of UN goals, not evidence about any policy's effect.
United Nations Academic Impact. Real-world source, read in full, 11 Nov 2026. Opening paragraphs
Used for: Quotes the 1987 Brundtland Commission definition of sustainability and links it to the Sustainable Development Goals.
Limits: Does not mention three pillars or dimensions.
Principles of Microeconomics 3e: 12.1 The Economics of Pollution
OpenStax, Rice University. Reference, read in full, 11 Nov 2026. Section 12.1
Used for: Externality, negative and positive externality, market failure; social cost as private cost plus external cost; with a negative externality the market produces more than the efficient output (worked table and figure).
Limits: Production-side framing; it does not use the MPC/MSC/MPB/MSB labels or draw consumption externalities, and it does not shade a welfare-loss triangle. University-level US textbook: its wording, examples and diagrams are not IB wording and it is not an authority for IB scope or SL/HL level.
Principles of Microeconomics 3e: 13.3 Public Goods
OpenStax, Rice University. Reference, read in full, 11 Nov 2026. Section 13.3
Used for: A public good is nonexcludable and non-rival; the free-rider problem; government paying for public goods through taxes; common resources (nonexcludable but rival) and the tragedy of the commons, with Ostrom's alternative view.
Limits: Does not discuss contracting out of provision. University-level US textbook: its wording, examples and diagrams are not IB wording and it is not an authority for IB scope or SL/HL level.
Externalities: Prices Do Not Capture All Costs
IMF Finance & Development, Back to Basics (Thomas Helbling). Reference, read in full, 11 Nov 2026. Whole article, dated 10 May 2017
Used for: Negative and positive externalities; private versus social costs and returns; over- and under-production; Pigouvian taxes and subsidies; bargaining and property rights (Coase); public goods as nonexcludable and nonrival; greenhouse gas emissions as a global problem.
Limits: No diagrams or calculations; does not use the terms merit or demerit good.
Costa Rica's Forest Conservation Pays Off (feature story, 16 November 2022)
World Bank. Real-world source, read in full, 11 Nov 2026. Whole feature
Used for: Forest cover close to 60% versus as low as 40% in 1987; PES pays landowners; first FCPF payment of $16.4 million; ERPA up to $60 million
Limits: Feature story from 2022; gives no PES start year, funding source or cumulative payments. Attribution of forest recovery to PES alone is contested.
Human Development Report 2025, Statistical Annex Tables 1–7
United Nations Development Programme. Real-world source, read in full, 11 Nov 2026. Tables 1 (HDI), 2 (trends), 3 (IHDI), 5 (GII); country rows named in each claim
Used for: HDI, components, GNI per capita, IHDI and GII values and ranks for 2023
Limits: Data year is 2023. Read from pdftotext (raw mode) extraction; values cross-checked between Tables 1, 2 and 3. Superseded when HDR 2026 is released (1 December 2026).
The 2026 Happy Planet Index: Executive Summary
Hot or Cool Institute. Real-world source, read in full, 11 Nov 2026. pp. 4–6
Used for: 2026 edition covers 134 countries with data to 2025; Costa Rica first; Tajikistan third; Spain fourth; global HPI 43.7 (2007) to 48.5 (2025)
Limits: Published by a think tank, not an intergovernmental body. Country scores were not readable on the results page (table failed to render).
Sustainable Development Report 2026: Rankings
UN Sustainable Development Solutions Network (SDSN). Real-world source, read in full, 11 Nov 2026. Rankings table
Used for: SDG Index 2026 rank and score for named countries; 169 countries ranked
Limits: SDSN is an independent network, not the official UN SDG report; its index method differs from the UN's target-by-target assessment.
United Nations Department of Economic and Social Affairs. Real-world source, read in full, 11 Nov 2026. Overview and Goals 1-17
Used for: The 2030 Agenda for Sustainable Development was adopted by all UN Member States in 2015 and sets 17 Sustainable Development Goals.
Limits: Contains no poverty lines and no definitions of the Gini coefficient, HDI, GII or MPI.
Take Action for the Sustainable Development Goals
United Nations. Real-world source, read in full, 11 Nov 2026. Introduction and Goals 1–17
Used for: Lists the 17 Sustainable Development Goals with a one-line summary of each and states that the goals are interconnected.
Limits: Does not define sustainable development, and contains no poverty lines, no Gini, HDI, GII or MPI definitions and no analysis of tax or poverty policy. A statement of goals, not evidence that any policy caused an outcome.
United Nations Department of Economic and Social Affairs. Real-world source, read in full, 11 Nov 2026. Introductory paragraph and goal list
Used for: 17 SDGs within the 2030 Agenda, adopted by all UN Member States in 2015
Limits: No progress data.
Press release: The Sustainable Development Goals Report 2026 (7 July 2026)
United Nations. Real-world source, read in full, 11 Nov 2026. Whole release
Used for: Share of SDG targets on track / too slow / regressing; extreme poverty; ODA fall of 23.1% in 2025; SDG financing gap; external debt
Limits: Press release, not the full report; headline shares apply only to the 139 targets with trend data.
Household air pollution (fact sheet, 16 December 2025)
World Health Organization. Real-world source, read in full, 11 Nov 2026. Key facts
Used for: 2.1 billion people cook with polluting fuels; 2.9 million deaths in 2021; rural 49% versus urban 14%; 1.8 billion still without clean cooking in 2030
Limits: Modelled global estimates.
Global Multidimensional Poverty Index 2026: Statistical update
UNDP and Oxford Poverty and Human Development Initiative. Real-world source, read in full, 11 Nov 2026. pp. 1–3
Used for: 1.2 billion people (18.9%) in acute multidimensional poverty across 108 countries; age, rural/urban, regional and indicator breakdowns
Limits: Covers 108 developing countries only; surveys come from different years (2013–2024). Read from pdftotext extraction.