Think of it like this: books are supposed to bring knowledge to everyone, from those who can afford a brand new edition to those who can't.
And there are some books they don't publish anymore, they can only be found in secondhand book stores.
And if one book can be used by several people, it is economical. You buy a paper book, read it once or twice, and if you hardly reread it, why don't you give others the opportunity?
Same with library.
I love used book stores. Those are heavens on earth.
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