To discuss a trade-off, compare the options on each criterion the question gives, weigh them using the stated priorities, and say how the decision would change if the priorities changed. The skill appears when two uses of land, two energy sources or two types of development are set against each other.
It uses everything earlier in the economic activities and resources module, especially the habit of using only supplied evidence from tracing a production network.
What is a trade-off?
A trade-off means gaining something and giving something up. A factory may bring jobs and income but reduce the quality of the local environment. A solar farm may protect the environment but employ fewer people.
Good discussion names who gains, who loses and what the criteria say. The criteria must come from the question, such as jobs, cost, environment and local community.
How do you discuss step by step?
- List the criteria exactly as the question gives them.
- Compare the options on each criterion using the evidence supplied.
- Use the weights, if given, to calculate a weighted score: score × weight, then add.
- State the result and which option it favours.
- Test the conclusion: change one weight and say whether the ranking changes.
Worked example
A council compares two uses for an area of scrubland. The scores and weights are invented for this example. Scores run from 1 (poor) to 5 (very good), and the weights show how much the council values each criterion.
| Criterion | Weight | Option 1: solar farm | Option 2: factory |
|---|---|---|---|
| Jobs | 3 | 2 | 5 |
| Income for the area | 2 | 3 | 4 |
| Protecting the environment | 3 | 5 | 2 |
Option 1. (2 × 3) + (3 × 2) + (5 × 3) = 6 + 6 + 15 = 27.
Option 2. (5 × 3) + (4 × 2) + (2 × 3) = 15 + 8 + 6 = 29.
Result. Option 2 is ahead by 2 points under these weights.
Test. Raise the environment weight from 3 to 4. Option 1: 6 + 6 + 20 = 32. Option 2: 15 + 8 + 8 = 31. Now Option 1 leads by 1.
Discussion. “Under the council’s stated weights, the factory scores 29 against 27 because it provides more jobs and income. However, the margin is only 2 points. If the environment is weighted slightly higher, the solar farm leads, 32 to 31. The decision therefore depends on how the council balances jobs against the environment, and a firm recommendation needs more evidence on both.”
What is the mistake to watch for?
A common slip is to bring in criteria the question did not supply.
Mistaken answer: The factory is better because it will attract tourists and raise house prices.
The criteria list contained neither tourism nor house prices, and no evidence supports either claim. The correction is to use only the given criteria and to mention any extra idea as a suggestion for further information, not as part of the score.
Also avoid a one-sided answer. Say what the other option does well.
Check yourself
1. Using the weights in the example (jobs 3, income 2, environment 3), a third option scores jobs 4, income 3 and environment 3. Find its weighted score.
Show answer
(4 × 3) + (3 × 2) + (3 × 3) = 12 + 6 + 9 = 27. It ties with Option 1 and trails Option 2 by 2.
2. In one sentence, why is a weighted score not the whole answer?
Show answer
The scores and weights are judgements, so the discussion must say how the result would change if they changed, and who gains and loses.
3. The question lists only “cost” and “jobs”. A student also discusses noise. Is that acceptable?
Show answer
Not as part of the main comparison, because noise was not a supplied criterion. It can appear as a short note that further information would be needed.
Where does this lead next?
Work through the economic activities practice set to combine all five skills. The statistics and distribution explorer helps with the tables behind a trade-off. For the wider subject, return to the Geography learning guide.
Balanced judgement paragraphs are the hardest to practise alone because it is difficult to see what is missing. A teacher in online one-to-one Geography tuition can read your draft and show you where the argument could be firmer.