我在看的时候觉得模型多比较混乱　各个模型具体的差别　分不太清楚　　那该怎么办呢？

看着似乎作者说的很有道理　　但你一问我具体的细节　　我就晕了

it depends what do you want to study.If you are looking at long term, then you should refer to different growth models. When you want to look at short-term, then you should look at models of real business cycle. Because there are different shcool of thoughts, there are different approach to economics problems. And some models are useful for study a particular phenomonen. The important thing is that we should have a good grasp of the intuitive behind things, it is the explanation that you can give matters