I went to the woods because I wanted to live deliberately. I wanted to live deep and suck out all the marrow of life. To put to rout all that was not life. And not, when I had come to die, discover that I had not lived.

关键在于，政府通过税收、补贴或监管改变激励的政策效果，往往与政策支持者声称的大不相同。

神秘就在公开之处。