A person completes first-aid training and later helps an injured stranger. The benefit received by the stranger is best described as
a negative externality from production
a positive externality from consumption
a private cost of the training course
the trainer's sales revenue
83 exam-style questions on AQA GCSE Economics 1.6 Market failure, covering 1.6.1a Market failure as misallocation of resources, 1.6.1b Government intervention, 1.6.2a Defining externalities, and 1.6.2b Positive and negative externalities. Each one has a worked solution and a mark scheme showing where the marks go.