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I don't know why people value cigarettes, but I don't, which means it must be subjective.

Alright. I happen to also recall clients telling me they use rolls of toilet paper as money.

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I do understand why people value toilet paper, but there are people who don't use it by choice, which means it's only subjectively valuable.

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What about blood cells? And if we exclude people with suicidal tendencies?

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You mean the things people regularly give away for free at blood drives.

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