刚上没多久的Economics,tutor布置了一篇coursework，它的Unit Title是

     Mankiw states that people are rational,they respond to incentives and they think at the margin.Explain how the supply and demand model incorporates all these principles.

  字数要求1500字左右，还得用4部以上参考文献，这题目是不是要用供求曲线解释曼昆的这三个原理啊。可是应该用什么思路构造文章框架呢？

高手指点迷津啊，感激不尽。