Consumer and producer surplus are the two labelled about the diagram. Purchaser surplus is discovered above the equilibrium line, and is the area or surplus of what consumers need to spend and the things they are willing to spend. 其实这与学生的水平是没有关系的，本身中国学生的英语方面是较弱的。本身应试教育的思维习惯，没有独立思考和批判性思维的习惯，无法写好国外的论文。为了更好的迎合中... https://scrapbookmarket.com/story12560960/essay%E4%BB%A3%E5%86%99-things-to-know-before-you-buy