(a)
(b)
A dominant strategy is the strategy chosen by a player irrespective of strategy chosen by the other player.
For Player 1, best strategy is B whether Player 2 chooses A or B, since payoff is higher in each case (600 > 400 & 200 > 100).
Player 1's dominant strategy - Strategy B
For Player 2, best strategy is B whether Player 1 chooses A or B, since payoff is higher in each case (600 > 400 & 200 > 100).
Player 2's dominant strategy - Strategy B
(c)
Nash equilibrium exists when each player chooses its strategy on basis of strategy chosen by the other player.
When Player 2 chooses A, Player 1's best strategy is B since payoff is higher (600 > 400).
When Player 2 chooses B, Player 1's best strategy is B since payoff is higher (200 > 200).
When Player 1 chooses A, Player 2's best strategy is B since payoff is higher (600 > 400).
When Player 1 chooses B, Player 2's best strategy is B since payoff is higher (200 > 200).
Therefore, Nash equilibrium is: (Player 1 chooses B, Player 2 chooses B) [see below]
(d)
Aggregate payoff is highest when (Player 1 chooses A, Player 2 chooses A) [Aggregate payoff = 400 + 400 = 800].
NOTE: As per Answering Policy, 1st 4 parts are answered.
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