来自《耶鲁大学开放课程：金融市场 第3集 第3集》
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It's maybe something that has evolved也许是某些更先进 -
as something that actually works.更有效的方式 -
You have a progressive tax system我们有随富有程度加重税负的 -
that takes more money from the wealthier people累进税制 -
and you have a welfare system还有关注个体并进行再分配支出的 -
that looks at individual hardship and pays out.福利制度 -
It does create moral hazard problems--这会引发道德风险问题 -
that's a problem with it,这是弊端所在 -
but that's something that we're learning about.但这也正是我们要学习研究的 -
That's part of public finance--is learning公共财政学的一个课题就是 -
how to modify the tax system so that it works pretty well.研究如何改进税收制度 使其更有效 -
I want to start out我想从