Sustainability and the SDGs: IB Economics 4.7 notes

What sustainable development means

The standard definition comes from the 1987 Brundtland Report: development that meets the needs of the present without compromising the ability of future generations to meet their own needs. It rests on three pillars that must move together: economic (rising real incomes), social (equity, health, education) and environmental (protecting the natural capital output depends on).

Keep three IB terms distinct. Economic growth is a rise in real output (real GDP). Economic development is broader and multi-dimensional: incomes plus health, education and freedoms. Sustainable development adds the condition that today's gains do not deplete the resources and environment future generations will need. Sustainability is one of the nine key concepts, so examiners expect you to name it.

The Sustainable Development Goals

The Sustainable Development Goals (SDGs) are 17 goals adopted by UN member states in 2015, with targets set for 2030. They succeeded the Millennium Development Goals (2000 to 2015). Examples you can cite include SDG 1 (no poverty), SDG 4 (quality education), SDG 5 (gender equality) and SDG 13 (climate action).

The goals are described as indivisible: progress on one supports the others. Educating girls (SDG 4 and 5), for instance, tends to lower child mortality and fertility and raise household incomes, feeding back into poverty reduction. Naming one specific SDG in an answer earns application marks.

Poverty and inequality as barriers

Absolute poverty means living below a basic-needs threshold; the World Bank's extreme-poverty line is about $2.15 a day at 2017 PPP. Relative poverty means falling below a set share of median income in a given society, so it exists even in rich countries and captures exclusion rather than survival.

High inequality, measured by the Gini coefficient (0 = perfect equality, 1 = one person holds all income), can slow development. It concentrates spending power, limits the poor's access to education and credit, weakens the domestic market and can fuel instability. Poverty is also self-reinforcing, which links directly to the poverty cycle in 4.9.

Sustainability and growth: complement or conflict?

In the short run there is real tension. Growth powered by fossil fuels, deforestation and over-fishing degrades the natural capital that future output relies on, so measured GDP can rise while the resource base shrinks.

But growth and sustainability are not always opposed. Higher incomes can fund clean technology, sanitation and conservation. The environmental Kuznets curve idea (pollution rises then falls as income grows) is contested but suggests a turning point. The key concept for evaluation is decoupling: raising output while cutting resource use and emissions per unit, which some economies have achieved in part.

Common pool resources in developing economies

Common pool (common access) resources are rival but non-excludable: fish stocks, forests, grazing land and clean water. Because no single owner can exclude others, each user has an incentive to over-exploit, producing the tragedy of the commons and depletion of the resource for everyone.

Developing economies are especially exposed. Many people depend directly on these resources for their livelihoods, and weak property rights and institutions make collective management hard. Examples include overfishing off West Africa and deforestation in the Amazon and in Indonesia for palm oil.

Real-world example

Costa Rica reversed heavy deforestation by paying landowners for ecosystem services (keeping forests standing to store carbon and protect watersheds). Forest cover recovered while incomes rose through eco-tourism, an example of pursuing growth and environmental sustainability together.

For an intergenerational-equity example, Norway channels finite oil revenue into a large sovereign wealth fund, converting a depletable resource into a diversified financial asset for future generations rather than consuming it today.

Common Paper mistakes

Do not treat a rise in GDP as automatically sustainable, and do not use growth and development as synonyms; the social and environmental pillars are where marks are won or lost.

Avoid assuming sustainability always conflicts with growth. Top-band answers weigh both directions and reference the key concept of sustainability explicitly. Define absolute versus relative poverty precisely, since using them interchangeably is penalised.

How this is examined

• Development appears on Paper 1 as extended response (Explain/Evaluate) and on Paper 2 as data response; a named SDG plus a specific country moves an answer into the top mark band.
• For a 15-mark evaluation, explicitly weigh short-run growth against long-run sustainability and name the key concept of sustainability.
• Define absolute and relative poverty separately and give the rough World Bank line ($2.15/day, 2017 PPP); examiners reward precise terminology.

Key terms

sustainable developmentdeveloping economyeconomic growthgini coefficienthuman development index hdi