WTF why did he (the precommiter) choose split after all?
If the other guy (Abraham) had chosen "steal", the supposed precommitter (Nick) would not have gotten anything either way, under any scenario.
If Abraham had chosen "split", it was a time-saver to have the gameshow hosts divide the money between them, than to gift half of it afterwards to him.
So Nick's whole ploy was to effectively scare Abraham into saying "split" -- by making him think that contrary to normal expectations it was saying "steal" that would ensure he would get nothing. Once Nick had convinced him of that, there was no longer any need to say "steal": Nick had either managed to convince him or he hadn't.
Nick sacrifices credibility for future claimed precommitments of course.
Nick sacrifices credibility for future claimed precommitments of course.
He sacrifices credibility in future threats against people, but maintains credibility in future promises to act in others' benefit just as much as if he had decided to steal and then give Abraham half the money. This latter credibility is probably much more useful in most real situations.
I found this to be a very interesting method of dealing with a modified Prisoner's Dilemma. In this situation, if both players cooperate they split a cash prize, but if one defects he gets the entire prize. The difference from the normal prisoner's dilemma is that if both defect, neither gets anything, so a player gains nothing by defecting if he knows his opponent will defect; he merely has the option to hurt him out of spite. Watch and see how one player deals with this.
http://www.youtube.com/watch?v=S0qjK3TWZE8