Ms. Marrou,
Sorry about the unexplained discussion tangent. The Prisoner's Dilemma is part of a body of knowledge generally labeled "Game Theory". Game Theory is often considered to be part of Economics.
It is called "Game Theory" because what it simulates, or models, is the results of decision-making in competitive/cooperative situations. I should point out that game theory has 'grown into' becoming a branch of knowledge in it's own right gradually. People came to realize that several different social issues that they used to think were entirely distinct problems could all be modeled and dealt with using similar techniques.
(Kind of like how all kinds of different businesses used to do telephone sales and customer service in various departments of their operations, before they realized that concentrating it all into call centers made more sense). The Prisoner's Dilemma is one of the "games", and it is still more famous than Game Theory itself.
Think of a poker game, or whatever kind of card etc. game is played for money where you are. The idea is that you have (1) a fixed set of rules, (2) players that make decisions within those rules, based on what they guess/believe the other players will do, (3) to maximize their own payoffs.
In one version of the Prisoner's Dilemma, you have two guys J. and I, who have been arrested for committing some crime together. The cops have them, and have locked them up in separate cells, so they cannot communicate.
J. and I can each individually decide to confess, or not to confess. If J. confesses, and I confess, we each get 5 years. If J. confesses, but I do not, J. gets 2 years, and I get 10 years. If I confess, but J. does not, I get 2 years, and J. gets 10 years. If *neither* of us confesses, we both get convicted of a lesser crime and only get 3 years.
Given the facts, you can map out the payoffs in a two-by-two grid.
Now, obviously, both J. and I together are better off if *neither* confesses. The *best* result either of us can hope for is to confess while the other guy keeps quiet (confessor gets 2 years, silent gets 10). But both of us know that, too. So we have to look at which choice to make.
I can get 2, 3, 5, or 10 years.
If I choose to confess, I get either 2 or 5 years.
If I do not confess, I get 3 or 10 years.
*Here's the important part: no matter what the other guy does, I'm better off confessing.* And J. knows this too, because he's done the same calculation.
So I *know* what he'll do: J. will confess. So I will, too.
Result: both J. and I will *always* confess, if we're smart. But this is **not** the best result we both could get: 3 years each, for keeping our mouths shut.
So, under the right conditions, two different people competing for the best outcome for themselves, make all the right decisions but wind up with an imperfect outcome.
The Prisoner's Dilemma is real, and cops the world over use it, every day. Whenever they arrest several people, the first thing they do is split them up so that they cannot communicate, then tell them they can reduce their sentences by confessing, but if they keep quiet, they're in for harsh treatment. PD works.
PD sort of applies to this bulletin board, in the sense that it can be seen as a series of PD games.
The decision each person has to make is whether to contribute knowledge, or just take ideas without contributing. Each person does not know if the others will contribute. We all do better if all of us contribute, but not as well as some one person might do if the others contribute, and he or she just takes their ideas.
What we want to avoid, is each person individually deciding that their payoff is better if they do not contribute, no matter what others do. We want the reverse of that, so each person is at least no worse off by contributing, no matter what others do.
In a (very long) nutshell, that's what Closed and I were talking about. It is right to say that PD does not work if one of the players/teams has nothing to offer. My response was that we don't even know how much the payoffs are worth.
Marianne Marrou may have ideas/knowledge/contacts that are worth *way* more to me than they are to her, for whatever reason. The reverse can be true also-- this is why it makes sense to trade ideas/knowledge/contacts. But neither of us knows what the other might have, so we run the risk of holding back because each of us is afraid that the other will benefit and we will not, or even lose.
My responses are getting waaay to long, sorry.
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