Please only answer Questions 1,3,4,6. For Q1, don’t forget to insert graphs or mathematic models to explain (you could search for useful graphs or models online) with detailed explanations. Also, for Q3, don’t forget to use reference or in-text citation. Why does policy change could cause power plants to go up? For Q4, mention marginal pollution control cost and regulator (tax or quantity) For Q6, mention cost-effective control and emission standard. Each question could have a reference to support the idea. For Q1, the reference should be Fairbrother, M. H. (2016). Externalities: why environmental sociology should bring them in
