Monday, September 8, 2014

Prisoner’s Dilemma



Prisoner’s Dilemma

Do you screw the other guy over or do you wait until he screws you over?  The answer is simple.  Mathematics solves this problem simply and elegantly – specifically a branch of mathematics called game theory.  But, we will keep it simple here for those who are algebraically challenged.

Very Simple Answer

If there is a probability greater than 50% that you will have to deal with the other guy again in the future, you are better off not screwing him over.  Otherwise, you should screw him over - so the theory suggests.

Illustration

Here is an illustration of the game:


Suboptimal Game

Why is it suboptimal, why is it important, and who the hell cares?  Well, we encounter the Prisoner’s Dilemma every day.  Why should I hold up my part of the bargain when I do not know if the other guy will or not?  If I renege, he gets screwed over.  If I do not, he can screw me over.  The best outcome is if we both keep our part of the deal, but how can I know that, and do I allow myself to be played like a fool if he reneges?  No, I am no fool, so I renege, and he does too.  We have to, because we do not trust each other and there is no chance of a future relationship or a deal, so the optimal strategy is to be a bastard.  Look at the diagram.  Study it well.  Learn the lessons.

Optimal Recurring Strategy

Scott Stevens in his course at the Teaching Company on Game Theory says that with simulations and some mathematics, the optimal strategy in recurring games of the Prisoner’s Dilemma does indeed exist.  Here it is: in your next move, do exactly what your adversary did in the previous move.  If he remained silent, remain silent; if he confessed, confess.  Another way of putting the same point:


  • Be easily provoked and retaliate immediately. 
  •  Be easy to forgive and forget immediately.

Somebody wants to play nasty?  It is Tit for Tat.  It is mathematical, scientific, and the optimal strategy.

These two points taken together, my friends, is a very important key to the Game of Life.

Be careful out there.  And, have fun.

Freddy Martini

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