Vaccination reduces the chance that other people catch an illness. Explain why vaccination can create a positive externality.
127 exam-style questions on OCR GCSE Economics 3.8 Limitations of markets, covering 3.8.1 Positive and negative externalities, 3.8.2 Policies to correct externalities, 3.8.3 Impact of externality policies, and 3.8.4 Costs and benefits of externality policies. Each one has a worked solution and a mark scheme showing where the marks go.