Lil: As an idea it does cause one to think, I agree with you on that. But don't you think that assigning values to the probability of an event, ie: an assasination, would not drive someone with money on the table to influence or ensure the outcome of said event? It seams to me that the consequences of something like this would be tremendous and may actually lead to an increase in attacks spurred on by people who have a chance to profit from them, if not directly, through an agent acting on thier behalf in the US.
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UQ: As I said (or tried to say) the entry of real money into this equation makes it a non-starter. They probably would have been better served by inviting in people from academia, think tanks,etc, set up dummy accounts like those stock picking contests, paid them a flat fee for their time and saw what happened.
DARPA's record speaks for itself and I find it hard to be overly critical of them because of it. They do spend a lot of money however but I would guess the ROI is pretty damn good.
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The bad part that occurred instantly to me is what Lil, mentioned. Bet and self fulfill. The good part is that maybe if you knew something you could inside trade.
Thinking the worst doesn't cause it to happen, at least if it's not about your own life, but it might not be too good an idea to publish the predictions cause that could give people some potentially creative inspirations. Like a lot of theigs, there are pros and cons. I wonder if rewards like what got the Saddam boys, that prevent attacks wouldn't be more effective. It might be a good way to probe for vulnerabilities, though.