Dynamic games: Backward induction and subgame perfection
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1 Dynamic games: Backward induction and subgame perfection ectures in Game Theory Fall 04, ecture Daniel Spiro, ECON300/400 ecture 3
2 Recall the extensive form: It specifies Players: {,..., i,..., n} What actions an acting player can choose among, what an acting player knows. Payoff for each of the players as a function of the actions that are realized. Decision node (initial node) Game tree Decision nodes,,, 0 Some terms: Successor Payoffs Predecessor assigned to Immediate players and sucessor at terminal nodes Immediate predecessor Daniel Spiro, ECON300/400 ecture 3
3 Tree rule Every node is a successor of the initial node, and the initial node is the only one having this property. Not OK OK U 3 D Daniel Spiro, ECON300/400 ecture 3 3
4 Tree rule Each node except the initial node has exactly one immediate predecessor. The initial node has no predecessor. Not OK Not OK Daniel Spiro, ECON300/400 ecture 3 4
5 Tree rule 3 Multiple branches extending from the same node have different action labels. Tree rule 4 Each information set contains decision nodes for only one of the players. Not OK OK Daniel Spiro, ECON300/400 ecture 3 5
6 Tree rule 5 All nodes in a given information set must have the same number of immediate successors and they must have the same set of action labels on the branches leading to these successors. Not OK Not OK Daniel Spiro, ECON300/400 ecture 3 6
7 Perfect recall A player remembers what he once knew. Not OK OK Daniel Spiro, ECON300/400 ecture 3 7
8 Perfect recall A player remembers what he once did. Not OK OK Daniel Spiro, ECON300/400 ecture 3 8
9 Perfect information Each information set contains only one decision node. Imperfect information There is at least one contingency in which an acting player does not know exactly where he is Daniel Spiro, ECON300/400 ecture 3 9
10 Analyzing dynamic games A dynamic game can be analyzed both in the extensive form and the normal form. Stay out Entrant Fight Enter Incumbent Accept -, -, Incumbent Accept Fight Enter, -, - Entrant Stay out Are both NEa reasonable? Is threat of fight credible? Daniel Spiro, ECON300/400 ecture 3 0
11 Another example,,, 0,,,,, 0, Daniel Spiro, ECON300/400 ecture 3
12 Sequential rationality: An optimal strategy for a player should maximize his or her expected payoff, conditional on every information set at which this player has the move. That is, player i s strategy should specify an optimal action from each of player i s information sets, even those that player i does not believe (ex ante) will be reached in the game. Backward induction: The process of analyzing a game backwards in time (from information sets at the end of the tree to information sets at the beginning). At each information set, one strikes from consideration actions that are dominated, given the terminal nodes that can be reached Daniel Spiro, ECON300/400 ecture 3
13 Illustrating backward induction Stay out Entrant Enter Fight Incumbent Accept -, -,,,, Daniel Spiro, ECON300/400 ecture 3 3
14 Results Backward induction identifies a unique strategy profile in a finite perfect information game with no payoff ties. Such a strategy profile is a Nash equilibrium. Observation Backward induction generalizes rationalizability to perfect information games. (Not necessarily true of imperfect info games). Question ow to define equilibrium for ext.-form games so that equilibrium implies backw. ind. in perf. info. games Daniel Spiro, ECON300/400 ecture 3 4
15 Subgame Definition: A subgame in an extensive-form game a) starts with a decision node (the initiating dec. node) b) includes also all successors (decision nodes that can be reached from the initiating decision node). c) splits no information set (no included dec. node is in an information set that contains excluded dec. nodes). What are the subgames? Daniel Spiro, ECON300/400 ecture 3 5
16 Subgame perfect Nash equilibrium Definition: A strategy profile is called a subgame perfect Nash equilibrium if it specifies a Nash equilibrium in every subgame of the original game. Stay out Entrant Enter Fight Incumbent Accept -, -,,,, Daniel Spiro, ECON300/400 ecture 3 6
17 Results Any finite extensive-form game has a subgame perfect Nash equilibrium. In a perfect information game without payoff ties, the unique SPNE coincides with the strategy profile indentified by backward induction. Algorithm Consider the normal forms of all subgames. Determine the Nash equilibria of each subgame. Find the Nash equilibria of the whole game that are also Nash equilibria of each subgame Daniel Spiro, ECON300/400 ecture 3 7
18 Does actual behavior conform to subgame perfection? The centipede game/game of trust The ultimatum game Backward induction: Optimal to accept any positive amount, thus optimal to offer smallest positive amount. Experiments show this not to hold, people reject small offers no longer rational to offer small amounts. In search of homo economicus, enrich et al, Daniel Spiro, ECON300/400 ecture 3 8
19 The paradox of backward induction: Why should a player conform to backward induction at decision nodes where he/she knows that an earlier player has deviated from backward induction? Daniel Spiro, ECON300/400 ecture 3 9
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