Now, I wanted to compare it with another question that I--people have this simple idea that there's a best investment.
现在,让我们对比另一个问题,人们总是简单地认为存在一种最佳投资
We just want to get a rough idea so we can tell me they need to have another 20 or they need to have another 100.
我们只是想得出个大概的数目,这样我们就可以告诉他们,是还需要20本还是100本。
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