Gas central heating boilers and electric air-source heat pumps are considered by homeowners to be substitute heating systems. Explain how a sustained increase in the price of gas boilers may affect the demand for electric air-source heat pumps over time.
119 exam-style questions on Edexcel A A Level Economics 1.2.3 Price, income and cross elasticities of demand. Each one has a worked solution and a mark scheme showing where the marks go.