That's part of public finance--is learning how to modify the tax system so that it works pretty well.

公共财政学的一个课题就是,研究如何改进税收制度，使其更有效。

耶鲁公开课 - 金融市场课程节选

Public finance relates to the tax and welfare system that we have.

公共财政学涉及,税收和我们的福利体系。

耶鲁公开课 - 金融市场课程节选

In fact, you have to put that qualifier on just about anything you say in finance because the tax system is infinitely complex and every country has different taxes, different states have different taxes.

事实上你必须进行改进,不管你是在谈论哪个金融学问题,因为税制太复杂了,每个国家的税制不同,每个联邦州的税制不同

耶鲁公开课 - 金融市场课程节选