在美国学经济哪个大学比较好？

经济学和管理学是两回事
harvard school是偏管理 mba
经济学最有名的应该是univ of chicago

of course 哈佛商学院

美国商科好的学校N多，但门槛超级高，看你自己是怎么样的一个情况，才好申请。

Regradless of your green card, tuition is divided into out-state and in-state.According to which state your green card belongs to, you will be recognized in-state student or out-state student. The tuition of out-state student just like International student is much more than in-state student. I recommend you to stay your own state if you have to pay yourself.
By the way, you still have to take some placement tests to prove you can handle the course you will take in the university you are going to apply for.