Eliezer_Yudkowsky comments on Semi-open thread: blackmail - Less Wrong
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Blackmail. A wouldn't make the threat if A believed that B ignored such threats, and A would have no motive to paint the car green if B were a rock. Pricing of green makes no difference so long as the price is not negative.
Defining what a rock is is akin to defining what the status quo/disagreement point is. What if B were an automated rock that responded to "I'll paint it green" with "please don't, I'll offer £10", what would your feelings be then?
In this example that seems a little gratuitous, but I'm sure we can construct other examples where it's much more natural...
I assume you meant to say that (price of green - price of black) is not negative. If the price of green is £0.5 then it is not blackmail.
Now an example with a rock: http://lesswrong.com/lw/i07/semiopen_thread_blackmail/9dux