# Cartes-fiches

Fabienne Keller
Cartes-fiches 67 Cartes-fiches 5 Utilisateurs Deutsch Université 21.02.2013 / 22.07.2020 Pas de droit d'auteur (CC0)
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a) Describe a game with perfect information.

b) And give some examples.

(belongs to "extensive form games")

a) a player moves
his action is observed by the other player who then moves
and his action is observed by the other player and so on, until the game finishes.

b) - removing sticks

- chess

- game played with myself (alarm clock)

- incrumbent and challenger (price fight or not?)

How do we usually solve a game with perfect information?

⇒ Games of perfect information are typically solved backwards starting at the end, and are very important to understand credibility of threats and commitment.

Describe a normal form game.
normal form is a description of a game. Unlike extensive form, normal-form representations are not graphical per se, but rather represent the game by way of a matrix. While this approach can be of greater use in identifying strictly dominated strategies and Nash equilibria, some information is lost as compared to extensive-form representations

Describe an equilibrum in a normal form game.

You have played an equilibrium if your choice was a best reply to the other player’s choice and this is also true for the other player, namely her/his choice is a best reply to yours.
In an equilibrium you cannot gain anything by choosing another strategy under the assumption that the other player does not change hers/his.

a) describe a simultaneous move game

b) and give some examples

a) simultaneous games are typically represented by the normal form; a game where both players have to decide/move simultaneously

b) prisoner's dilemma

decision or game:

a) a pair of teenage girls choosing dresses for their prom

b) a group of grocery shoppers in the diary section with each shopper choosing flavor of yogurt to purchase

a) game - girls choice affects the others choice

b) decision - no interaction among players

decision or game:

a) a college student considering what type of postgraduate education to pursue

b) the new york times and the wall street journal choosing prices for their online subscriptions this year

a) decision - doesn't affect other people

b) game - (Betrand; price competition; strategic)

What kind of decision theory is game theory?

Game theory is interactive decision theory

(It studies the behavior of players whoce decisions affect each other)