Blackmailer Paradox

The Blackmailer Paradox is a repeated game in game theory, a branch of applied mathematics. Nobel laureate Robert Aumann explains the case this way:
"Reuben and Shimon are placed into a small room with a suitcase containing $100,000 of cash. The owner of the suitcase offers them the following: "I'll give you all the money in the suitcase, but only on the condition that you negotiate and reach an amicable agreement on its division. That’s the only way I will give you the money."


"Reuben, who is a rational person, appreciates the golden opportunity presented to him and turns to Shimon with the obvious suggestion: "Come, you take half the amount, I'll take the other half, and each of us will go away with $50,000." To his surprise, Shimon, with a serious look on his face and a determined voice says: "Listen, I do not know what your intentions are with the money, but I'm not leaving this room with less than $90,000. Take it or leave it. I’m fully prepared to go home with nothing."


"Reuben can not believe his ears. What happened to Shimon? he thinks to himself. Why should he get 90%, and I only 10%? He decides to try to talk to Shimon. "Come, be reasonable," he pleads. "We're both in this together, and we both want the money. Come let’s share the amount equally and we’ll both come out ahead.”


"But the reasoned explanation of his friend does not seem to register on Shimon. He listens attentively to Reuben’s words, but then declares even more emphatically, "There is nothing to discuss. 90-10 or nothing, that's my final offer!" Reuben's face turns red with anger. He wants to smack Shimon across his face, but soon reconsiders. He realizes that Shimon is determined to leave with the majority of the money, and that the only way for him to leave the room with any money is to surrender to Shimon’s blackmail. He straightens his clothes, pulls out a wad of bills from the suitcase in the amount of $10,000, shakes hands with Shimon and leaves the room looking forlorn."
According to Aumann, relationships between Israel and the Arab states are conducted according to the principles of this paradox. He asserts that Arab negotiators make absolute and extreme demands at every peace conference


 
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