Game Theory Basics Quiz
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Questions and Answers

What is the best strategy for player 1 regardless of player 2's choice?

  • D
  • R
  • L
  • U (correct)
  • What will player 2 choose if player 1 selects U?

  • D
  • L (correct)
  • R
  • U
  • How are the payoffs represented in two-player strategic form games?

  • In matrix form (correct)
  • As a table of values
  • Through a vector
  • In a graph
  • What is player 2's payoff-maximizing strategy dependent on?

    <p>Player 1's strategy choice (A)</p> Signup and view all the answers

    Which strategy pair is the only sensible outcome of the game described?

    <p>(U, L) (A)</p> Signup and view all the answers

    What does the term 'dominant strategy' imply in the context of game theory?

    <p>A strategy that is beneficial regardless of opponents' strategies (A)</p> Signup and view all the answers

    What is the outcome deduced when a game is played by rational players?

    <p>The equilibrium outcome based on strategies (D)</p> Signup and view all the answers

    What does the notation [$−i$] signify in the context of joint pure strategies?

    <p>The strategies of all players except player i (D)</p> Signup and view all the answers

    Which concept indicates a more advanced understanding of strategic interaction than merely recognizing payoffs?

    <p>Subgame perfection (D)</p> Signup and view all the answers

    What characterizes a strategic decision rather than a non-strategic decision?

    <p>It requires anticipating the actions of other players. (C)</p> Signup and view all the answers

    In a strategic form game, how is the payoff for a player determined?

    <p>Through a function of their own strategy and those chosen by other players. (B)</p> Signup and view all the answers

    What is an essential feature of a Nash equilibrium?

    <p>Each player's strategy is an optimal response to the other players' strategies. (B)</p> Signup and view all the answers

    What is the role of unpredictability in strategic decision making?

    <p>It arises as players try to maximize their payoffs while considering opponents' strategies. (D)</p> Signup and view all the answers

    What distinguishes a Bayesian-Nash equilibrium from a regular Nash equilibrium?

    <p>It involves players having beliefs about the types of other players. (C)</p> Signup and view all the answers

    Which structure describes the strategic situation involving multiple players and their available strategies?

    <p>Strategic form game (B)</p> Signup and view all the answers

    In what way is subgame perfection stronger than Nash equilibrium?

    <p>It requires rational play in all subgames. (D)</p> Signup and view all the answers

    What condition defines a strictly dominant strategy for player i?

    <p>It is always better than any other strategy for player i, regardless of opponent's choice. (D)</p> Signup and view all the answers

    In the elimination of dominated strategies, what is a characteristic of a strategy that is strictly dominated?

    <p>It is never chosen because it yields a lower payoff than another strategy. (A)</p> Signup and view all the answers

    If player 1's strategy C is always outperformed by D, what can be inferred about C?

    <p>C is a strictly dominated strategy for player 1. (A)</p> Signup and view all the answers

    What does the notation $S_i^n$ represent?

    <p>The strategies of player i remaining after n rounds of elimination. (C)</p> Signup and view all the answers

    Which of the following scenarios illustrates strictly dominated strategies?

    <p>Player 2's strategy R always yields a higher payoff than strategy M when Player 1 plays D. (B)</p> Signup and view all the answers

    What result can be concluded when both strategies C and M are removed from the strategies set?

    <p>Both strategies were strictly dominated by other strategies. (A)</p> Signup and view all the answers

    What is the outcome represented by the pair (3, 0) in the context of game strategies?

    <p>It indicates the best outcome for player 1 with no payoff for player 2. (B)</p> Signup and view all the answers

    Which of the following best describes strategies after the nth round of elimination?

    <p>They are the strategies that remain undominated and viable for player i. (A)</p> Signup and view all the answers

    What characterizes a strategy that is iteratively strictly undominated?

    <p>It belongs to the set of strategies for player i across all iterations. (B)</p> Signup and view all the answers

    In game theory, a weakly dominated strategy is defined as one that:

    <p>Has at least one comparison where it performs worse than another strategy. (D)</p> Signup and view all the answers

    Which strategies are characterized as weakly dominated in the given situation?

    <p>D and R are weakly dominated by U and L. (B)</p> Signup and view all the answers

    What does the notation $W_i^n$ represent in game theory?

    <p>The strategies that survive the nth round of elimination of strictly dominated strategies. (D)</p> Signup and view all the answers

    Under what condition does a strategy qualify as iteratively weakly undominated?

    <p>It is not weakly dominated in the set of strategies remaining after each elimination round. (C)</p> Signup and view all the answers

    What happens to weakly dominated strategies when they are eliminated?

    <p>They can make eliminating strictly dominated strategies ineffective. (C)</p> Signup and view all the answers

    What is the implication of having no strictly dominated strategies present?

    <p>Players have a clearer choice in selecting optimal strategies. (B)</p> Signup and view all the answers

    Why is it important to identify both strictly and weakly dominated strategies in a game?

    <p>It ensures players can avoid dominated strategies to maximize their payoffs. (D)</p> Signup and view all the answers

    What condition must be satisfied for a situation to be considered a Nash equilibrium?

    <p>No player can improve their payoff by unilaterally changing their own strategy. (B)</p> Signup and view all the answers

    Which statement about pure strategy Nash equilibria is true?

    <p>A game may possess more than one pure strategy Nash equilibrium. (B)</p> Signup and view all the answers

    How is a mixed strategy defined in the context of Nash equilibrium?

    <p>It is a probability distribution over multiple strategies. (A)</p> Signup and view all the answers

    In which of the following cases can a Nash equilibrium exist?

    <p>When players randomize their choices and have no predictable strategy. (A)</p> Signup and view all the answers

    Which of the following describes a scenario where no pure strategy Nash equilibrium exists?

    <p>Players have conflicting goals and strategies. (B)</p> Signup and view all the answers

    What is the expected utility of both players in the batter-pitcher example when they use mixed strategies?

    <p>$0$ (B)</p> Signup and view all the answers

    What implication does knowing the opponents' strategy have in playing a Nash equilibrium?

    <p>It gives no advantage as changes lead to unpredictability. (D)</p> Signup and view all the answers

    Which of the following statements is incorrect regarding the characteristics of Nash equilibria?

    <p>All players have complete ignorance of others' strategies. (A)</p> Signup and view all the answers

    What does a mixed strategy allow players to do?

    <p>Randomize their choices among strategies (C)</p> Signup and view all the answers

    In the context of Nash equilibrium, what does the expected utility of player i's strategy represent?

    <p>The predicted payoff based on mixed strategies (B)</p> Signup and view all the answers

    How is the joint strategy represented in the context of mixed strategies?

    <p>As a combination of all players' actions (C)</p> Signup and view all the answers

    According to Theorem 7.1, what is one condition for a strategy to be considered a Nash equilibrium?

    <p>It must yield at least the same utility as any alternative strategy (C)</p> Signup and view all the answers

    What does the term 'incomplete information' refer to in game theory?

    <p>Some players are uncertain about others' payoff functions (A)</p> Signup and view all the answers

    What is required for a game to be considered under complete information?

    <p>Each player's payoff function is known to all players (A)</p> Signup and view all the answers

    What does the notation $u_i(m)$ signify in the context of expected utility?

    <p>Utility based on mixed strategy outcomes (B)</p> Signup and view all the answers

    What fundamentally changes when players use mixed strategies compared to pure strategies?

    <p>Strategies can involve randomness (C)</p> Signup and view all the answers

    What is a significant outcome of Nash's Existence Theorem?

    <p>Every finite strategic form game has at least one Nash equilibrium (A)</p> Signup and view all the answers

    Which of the following describes the normal-form representation of a game?

    <p>Players' strategies and payoffs are clearly outlined (B)</p> Signup and view all the answers

    What is an essential characteristic of a mixed strategy set, $M_i$?

    <p>It can represent any pure strategy via probability distribution (C)</p> Signup and view all the answers

    Which statement best describes a pure strategy within the context of game theory?

    <p>A consistent choice that does not involve randomness (D)</p> Signup and view all the answers

    What is the role of each player's utility function in the context of a strategic game?

    <p>To determine the payoffs based on chosen strategies (C)</p> Signup and view all the answers

    Flashcards

    Nash Equilibrium

    A situation where no player can improve their payoff by unilaterally changing their strategy, assuming other players remain unchanged.

    Bayesian-Nash Equilibrium

    Nash equilibrium where players' strategies depend on their private information or beliefs.

    Backward Induction

    A method for solving sequential games by working backwards from the end of the game to determine the optimal strategy.

    Subgame Perfection

    A refinement of Nash equilibrium that requires strategies to be the best response at every sub-game.

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    Sequential Equilibrium

    A solution concept for games with incomplete information that combines the idea of perfect Bayesian equilibrium and the concept of sequential rationality.

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    Non-strategic Decision

    A decision that can be made without considering the actions of others.

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    Strategic Form Game

    A game where the strategies available to each player and the payoffs for each combination of strategies are specified.

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    Strategic Game Elements

    The common elements involving players, strategies, and payoffs depending on a player's strategy and those of others.

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    Dominant Strategy

    A strategy that yields the best payoff for a player regardless of the strategy chosen by other players.

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    Rational Players

    Players who aim to maximize their own payoffs in a game.

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    Joint Pure Strategies

    The combinations of strategies chosen by all players in a game.

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    Solving a Game

    Determining the outcome of a game when played by rational players.

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    Payoff Matrix

    A table showing the payoffs for all combinations of strategies chosen by players in a game.

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    Strategy Set

    All possible choices available to a player in a game.

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    Payoff Vector

    A vector showing the payoffs for each player in a game given a combination of strategies chosen by all players.

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    Strictly Dominant Strategy

    A strategy for a player that always yields a higher payoff than any other strategy, regardless of the opponent's strategy.

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    Strictly Dominated Strategy

    A strategy that is always worse than another strategy, regardless of the opponent's strategy.

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    Iterative Elimination of Strictly Dominated Strategies

    A process to find the best possible outcome in a game by repeatedly removing strategies that are strictly dominated by other strategies.

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    Payoff

    The result or outcome for each strategy in a game.

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    Elimination of strategies

    Removal of suboptimal choices from the strategy set.

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    Best Choice

    The strategy that provides the highest payout for a player.

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    N-th Round Elimination

    Strategies that are strictly dominated in the previous round are removed. The surviving strategies become part of the new strategy set for the N-th round.

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    Iteratively Strictly Undominated Strategy

    A strategy for a player that survives multiple rounds of eliminating strictly dominated strategies.

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    Strictly Dominated Strategies - Elimination

    A strategy for a player is strictly dominated by another strategy if the other strategy always yields a higher payoff, regardless of what the other players do.

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    Weakly Dominated Strategies - Elimination

    A strategy for a player is weakly dominated if another strategy always yields a payoff that is at least as good, and sometimes better.

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    Iteratively Weakly Undominated Strategy

    A strategy for a player that survives multiple rounds of eliminating weakly dominated strategies.

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    Domination vs. Elimination

    Domination is the relationship between strategies, while Elimination is the process of removing strategies.

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    Multiple Rounds of Elimination

    Iterative elimination refers to multiple rounds of removing dominated strategies, where the new set of strategies becomes the basis for further elimination.

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    Impact of Dominated Strategies

    Dominated strategies can be removed because a player can always do better by switching to the dominating strategy.

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    Unique Strategy Pair

    After eliminating dominated strategies, sometimes a single strategy combination for all players remains as the most rational choice.

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    Joint Strategy

    A combination of strategies chosen by all players in a game.

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    Pure Strategy Nash Equilibrium

    When each player's strategy maximizes their payoff given the other players' fixed strategies, and no player can improve by changing their own.

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    Mixed Strategy

    A player's strategy that involves choosing different actions with certain probabilities.

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    Mixed Strategy Nash Equilibrium

    A situation where each player's randomized strategy maximizes their expected payoff, given the other players' randomized strategies.

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    Expected Utility (in games)

    The average payoff a player expects to receive by using a mixed strategy, considering the probabilities of different outcomes.

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    Unilaterally Change (Strategy)

    Changing your strategy without coordinating with other players.

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    Pure Strategy

    A specific action that a player can choose in a game. Think of it as a definite plan of action.

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    Joint Mixed Strategy

    A combination of mixed strategies chosen by all players in a game.

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    Expected Utility

    The average payoff a player expects to receive when using a mixed strategy.

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    What is a simplified Nash Equilibrium test?

    A method to verify if a joint strategy is a Nash Equilibrium by analyzing individual player's payoffs for each pure strategy given positive or zero weight by their mixed strategy.

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    What does the Nash Existence Theorem state?

    Every finite strategic form game possesses at least one Nash Equilibrium.

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    What is complete information in a game?

    When all players know each other's payoffs for every possible combination of strategies.

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    Incomplete Information Game

    A game where some players have uncertainty about other players' payoff functions.

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    What defines a normal-form representation of a game?

    It specifies each player's strategy options and their payoffs associated with all possible combinations of strategies chosen by all players.

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    What is the Prisoners' Dilemma?

    A classic example of a game where two individuals acting in their own self-interest result in a worse outcome for both compared to if they cooperated.

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    What is a payoff function?

    A function that determines a player's payoff based on the combination of strategies chosen by all players.

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    What is a strategy space?

    The set of all possible strategies available to a player in a game.

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    What is a combination of strategies?

    A specific choice made by each player in a game.

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    What is a strategic form game?

    A game where all players choose their strategies simultaneously.

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    Study Notes

    Lecture 1 - Strategic Form Games

    • Game theory = the systematic study of how rational agents behave in strategic situations.
    • Each agent must know the others' decisions before determining their own best choice.
    • Includes concepts like Nash equilibrium, Bayesian-Nash equilibrium, backward induction, and subgame perfection.
    • Knowing when to apply each concept is important for applied economics.

    Lecture 2 - Strategic Form Games under Incomplete Information

    • Incomplete information = situations where some players are uncertain about other player's payoff functions.
    • This is different than the standard game's payoff function.
    • Includes Bayesian games.
    • Information about others' types.

    Lecture 3 - Extensive Form Games

    • Extensive form = a graphical representation of a game, using a game tree.
    • The nodes represent decisions and actions.
    • The lines connecting the nodes represent a logical sequence.
    • End nodes display payoffs.

    Lecture 4 - Extensive Form Games under Incomplete Information

    • Sequential equilibrium = a solution concept for extensive form games with incomplete information, building on Nash Equilibrium.
    • It addresses the issue of beliefs in cases where backward induction isn't directly applicable, due to incomplete information.

    Lecture 5 - Repeated Games

    • Deals with games that are played multiple times.
    • Explores the interactions between players when they know the game will be played many times.

    Lecture 6 - Mixed Strategies examples

    • Mixed strategies = players randomize their choices in a game.
    • Introduces mixed strategies' Nash Equilibria.

    Additional concepts

    • Iterative elimination of strictly dominated strategies: A method for simplifying games by eliminating dominated strategies, to determine which strategies are rational for players.
    • Rationality: Players choose strategies that maximize their expected payoffs (given their beliefs)
    • Common knowledge: A property is common knowledge if everyone knows it, everyone knows that everyone knows it, and so on.
    • Nash equilibrium: A strategy profile where no player can improve their payoff by unilaterally changing their strategy.
    • Subgame perfect equilibrium: A Nash equilibrium where every subgame of the game is a Nash Equilibrium
    • Correlated Equilibrium: A refinement of Nash Equilibrium that allows for correlated strategies, where players' actions may be coordinated.
    • Bayesian Equilibrium: A refinement of Nash Equilibrium that accounts for beliefs about the other players' types or strategies; used in situations with incomplete information.
    • Maxmin (and Minmax) strategies: A method for choosing strategies that maximize the minimum possible payoff and minimize the maximum possible loss.

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    Test your understanding of key concepts in game theory with this quiz. Explore topics such as dominant strategies, Nash equilibrium, and strategic decision-making. Challenge yourself with questions related to two-player strategic form games and their payoffs.

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