Taboo "rational".
Highest-scoring move, adjective applied to the course that maximises fulfillment of desires.
The best move in a one-shot PD is to defect against a cooperator.
With no communication or precommitment, and with the knowledge that it is a one-shot PD, the overwhelming outcome is both defect. Adding communication to the mix creates a non-zero chance you can convince your opponent to cooperate - which increases the utility of defecting.
Adding communication to the mix creates a non-zero chance you can convince your opponent to cooperate - which increases the utility of defecting.
There is a question of what will actually happen, but also more relevant questions of what will happen if you do X, for various values of X. If you convince the opponent to cooperate, it's one thing, not related to the case of convincing your opponent to cooperate if you cooperate.
A monthly thread for posting rationality-related quotes you've seen recently (or had stored in your quotesfile for ages).