and now this one goes down by forty-two twice,

这个每张降到了四十二
so maybe it's not such a great idea."

因此再买可能不是一个好主意
So what is he actually thinking?

他真的在想什么呢
All he's doing is he's looking at the price in this axis

他正在做的就是看着这个轴上的价格
and comparing it to his marginal utility,

将其与边际效用比较
the extra utility out of getting an extra ticket.

多买一张票所多获得的效用
So if the price is forty-two here

因此如果这里的价格是四十二
he's going to say, "Well, at a price of forty-two the first one's worthwhile.

他会说四十二的价格买第一张是值得的
I'm getting more utility out of that.

我会从中得到更多的效用
After that it's stupid to buy another ticket

在这之后再买一张票就是愚蠢的
because I'm getting extra utility of forty

因为我以四十二的价格得到了四十的效用
compared to a price of forty-two."

额外效用