So I think that's all the preliminaries.

这就是我们全部的开场白
There are two midterms, one in the middle of the class

你们有两次期中考试一次在学期中
and one right at the end.

一次在学期末
Anyway, the question we want to spend the whole of the class on

总之我们今天课要讨论的问题是
today is whether the free market is really such a great idea.

自由市场是否可取
And the quintessential example in which it is a great idea is

而用于解决此问题的典型例子
the one we did in class on the very first day.

就是我们第一堂课说到的例子
We had a bunch of football tickets and there were buyers

我们手头有一堆足球票而我们的买家
each of whom knew his own valuation and sellers each of

清楚的知道自己的估价
whom knew her own valuation and we threw everybody together and

卖家们也清楚他们的估价我们将他们
just very briefly explained the rules.

集中后简单解释一下规则
By the way, the only important rule was--there were two important rules.

顺面提一下我们有两条重要的规则