Over time, most optical lens manufacturers in a country have located in the same district.
Which change would provide evidence that this regional specialisation has benefited producers in the district?
Lens workers can move easily into other industries
The average cost of producing each lens has fallen
Each lens firm now makes all of its own parts itself
Lens firms no longer need buyers outside the district
76 exam-style questions on OCR GCSE Economics 2.1 The role of markets, covering 2.1.1 What is a market, 2.1.2 Primary, secondary and tertiary sectors, 2.1.3 Factor and product markets, and 2.1.4 Specialisation and exchange. Each one has a worked solution and a mark scheme showing where the marks go.