Consider a two-player game with the following material payoffs, where the first number in each pair is the payoff for Player A and the second is for Player B:
| Player B: Strategy X | Player B: Strategy Y | |
|---|---|---|
| Player A: Strategy X | (3, 3) | (1, 4) |
| Player A: Strategy Y | (4, 1) | (2, 2) |
Assume Player A is entirely self-interested and seeks only to maximize their own material payoff. Player B, however, is altruistic and makes decisions to maximize the sum
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