that he's got an apple now.

最初B有一个苹果
We aren't modeling what happened to get us here.

我们不管B是怎么用于这个苹果的
The guys got an apple today.

这个人有一个苹果
They both have an apple today.

这两个人在第一期都有一只苹果
Somehow A's also going to have another apple tomorrow that he's

不知怎样的A第二阶段又有一只苹果
going to find under his doorstep somehow that isn't being

也许是他碰巧拾到的
produced by the tree.

反正不是他买的树上结出的
And maybe you can think of it as labor that he's going to have

你可以把这个苹果当作
next period.

这个人的劳动力
All right, so that's it.

明白了吗
Fisher says as soon as you write down the economy

费雪说当你把经济问题
mathematically all sorts of things are going to occur to you

都写进数学式子中