Economic growth and the environment
The clause unique to this standard
- AS91224's impacts requirement reads: impacts "on various groups in New Zealand society and/or the environment".
- No other Level 2 Economics standard names the environment. It is in scope here, and the 2025 paper used it as the Excellence comparison.
How growth damages the environment
Resource depletion
- More output requires more inputs: water, minerals, timber, fish, soil.
- Using resources faster than they regenerate reduces the stock available for future production.
Pollution and emissions
- More production and transport means more greenhouse gases, more discharge to water, more waste to landfill.
- New Zealand's growth is heavily land-based, so intensification affects water quality, soil and biodiversity directly.
Land use change
- Converting land to a higher-value use — forestry to dairy, farmland to housing — changes what the land can do, sometimes irreversibly.
Congestion
- More economic activity means more vehicles, more emissions and more time lost.
Why this is an economics problem, not only an ethical one
- Environmental resources are factors of production. Clean water, fertile soil and a stable climate are inputs to New Zealand's largest industries.
- Damaging them reduces productive capacity, which on the PPF is an inward shift of the frontier.
- So environmental damage caused by growth today can reduce growth tomorrow. It is a growth issue in the standard's own terms.
And it is a trade issue too. New Zealand's exports compete partly on a clean, high-quality reputation. Damage to that reputation reduces the price overseas buyers will pay — a real cost to export receipts.
Why growth can also improve the environment
The relationship is not one-way, and saying so lifts an answer.
- Richer countries can afford environmental protection. Treatment plants, emissions technology, national parks and monitoring all cost money that only a productive economy generates.
- Growth funds R&D into cleaner technology, and new technology often raises output while reducing inputs and waste.
- Higher incomes raise demand for environmental quality. As basic needs are met, people place more value on clean rivers and accessible nature, and vote accordingly.
- A shift in the composition of output — from heavy production toward services, software and high-value niche goods — raises GDP with far less environmental impact per dollar.
Sustainable growth
- Sustainable growth meets present needs without reducing the ability of future generations to meet theirs.
- It means growth achieved by using resources more efficiently and by better technology, rather than by using more of a finite resource.
- On the PPF: sustainable growth shifts the frontier outward and keeps it there; unsustainable growth pushes output up now at the cost of an inward shift later.
The trade-off in the exam
| Policy or event | Growth effect | Environmental effect |
|---|---|---|
| Intensifying land use | Real GDP rises | Water quality and soil decline |
| Requiring cleaner fuel or technology | Costs rise, AS shifts left short run | Emissions fall |
| Investing in renewable electricity | Costs high now, AS shifts right later | Emissions fall |
| Expanding a polluting export industry | Export receipts rise, AD right | Local environment degraded |
| Improving efficiency of resource use | AS right — more output per input | Environmental pressure falls |
- The last row is the important one. Growth achieved through efficiency improves both, which is why it is the goal.
Worked ExampleGrowth against the environment
A New Zealand region expands an industry that increases output and employment substantially, but increases nutrient discharge into local waterways.
Compare and contrast the impact of this expansion on economic growth and on the environment, and give a reasoned judgement about whether it should proceed.
Step 1 — The impact on economic growth
Real GDP rises. The industry produces more output, which is counted in GDP. On the circular flow, export receipts and income rise; on AS/AD, both AD (more spending) and AS (more capacity) shift right, so real GDP rises with little inflationary pressure.
Employment and incomes rise in the region, and government revenue rises through income tax, GST and company tax while transfer payments fall.
Productive capacity rises in the short term: new plant and equipment are installed and land is brought into a higher-value use. On the PPF, the frontier shifts outward.
Step 2 — The impact on the environment
Water quality falls. Nutrient discharge causes algal growth, reduces oxygen and harms aquatic life.
Recreational, cultural and amenity value is lost — swimming, fishing and mahinga kai. None of this is priced, so none of it is deducted from GDP.
Biodiversity declines in affected waterways.
Step 3 — Compare
Both effects come from exactly the same expansion. The output that raises GDP and the discharge that degrades the water are two consequences of one increase in production — they cannot be separated by wishing.
Step 4 — Contrast — and this is the key move
The two effects appear on different timescales and in different accounts.
The growth benefit is immediate, measurable and appears in GDP. The environmental cost is gradual, cumulative and appears in no economic statistic at all.
But the environmental cost is also a growth cost, just a delayed one. Clean water is a factor of production for:
- Tourism, which sells New Zealand's environment
- Agriculture downstream, which needs usable water
- Fishing and aquaculture
- Export reputation, which supports the premium New Zealand products command
So degrading it reduces future productive capacity — an inward shift of the future PPF. The apparent trade-off between growth and environment is really a trade-off between output now and capacity later.
Step 5 — Judge
Whether it should proceed depends on three things, and the answer is conditional.
1 — Is the damage reversible? Nutrient loading that can be reduced by changing practice is very different from a permanently degraded aquifer or a collapsed fishery. Reversible damage is a cost; irreversible damage is a reduction in capacity that no future growth can buy back.
2 — Does the value of the extra output exceed the value of what is lost? GDP cannot answer this, because it prices one side and not the other. Net social welfare is the measure the standard names for exactly this purpose.
3 — Can the damage be reduced without losing the output? This is the decisive question. Requiring treatment, riparian planting or improved technology raises costs — AS shifts left slightly — but keeps most of the output while removing most of the discharge. If that option exists and is affordable, then the choice is not growth versus environment at all: it is a choice between a smaller growth gain with the environment intact and a larger one with it degraded.
Conclusion. The expansion should proceed only with the discharge controlled, because unconstrained expansion buys measured GDP today by consuming productive capacity — clean water — that New Zealand's largest export industries depend on tomorrow. Growth that reduces the future PPF is not economic growth in the sense this standard defines; it is consumption of capital that has not been counted.