Unintended effects on others — Economics, 11–13
Learn why a choice can affect people who were not part of the buying or selling, and why that matters.
A side effect on others
An externality is a side effect of an economic action that reaches people outside the deal. A noisy workshop may help its owner and customers, while nearby residents lose peace even though they bought nothing.
Why side effects matter
The problem is that the buyer and seller may count only their own costs and benefits. Economists noticed that pollution, noise and useful spillovers can make the outcome worse or better for a whole community, so the wider effect must be considered.
A bus and cleaner air
Suppose one car journey creates €2 of fuel and parking costs, plus €1 of pollution damage to others. The driver sees €2, but the wider cost is €3. If a bus ticket costs €2.50, taking the bus can reduce the total cost to people around the journey.
The deal is not the whole story
A reasonable mistake is to think an exchange affects only its two participants. That feels true because they agree on the price, but smoke, traffic or a newly planted tree can affect neighbours who were never asked.
Where you notice it
You meet externalities in recycling, public transport, building insulation and noise rules. A choice such as cycling can benefit other people through cleaner air, while loud music late at night can impose a cost on them.
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