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Algorithmic Game Theory
Money Pump
a < b < c < a
if you pay one euro because you prefer the next version someone can trade you the the Better versions for the lower ones +1 euro and can distract infinite euros from you.
Algorithmic Game Theory
A preference relation is called rational if it is?
complete (i.e., ∀x,y ∈ A: (x ≿ y) ∨ (y ≿ x))
and
transitive (i.e., ∀x,y,z ∈ A: (x ≿ y) ∧ (y ≿ z) ⇒ (x ≿ z)).
Algorithmic Game Theory
Transitivity means ... (in one word)
Indistinguishability
Algorithmic Game Theory
Continuity (definition)
For all L1 ≻ L2 ≻ L3, there is some p ∈ (0,1) such that L2 ~ [p : L1, (1-p) : L3].
Algorithmic Game Theory
Continuity implies that, ...
Continuity implies that, if the probability of a plane crash (L3) is sufficiently small, you still prefer flying to Hawaii.
Algorithmic Game Theory
Independence (definition)
For all L1, L2, L3 and all p ∈ (0,1), L1 ≿ L2 ⇔ [p : L1, (1-p) : L3] ≿ [p : L2, (1-p) : L3]
Algorithmic Game Theory
Independence implies that ...
Independence implies that an equal probability of a plane crash (L3) for each trip (no matter how large) will not affect your preference.
Algorithmic Game Theory
What do we need to get a von Neumann expected utility theorem?
if take all 4 axioms(transitivity, completeness, continuity, independence), then we get von Neumann expected utility theorem
Algorithmic Game Theory
Risk Aversion
Utility can be very different from monetary value.
People buy insurances because their utility is concave in value. They are risk-averse.
People buy lottery tickets because their utility is convex in value. They are risk-seeking.
Algorithmic Game Theory
Allais Paradox
Which lottery would you prefer?
Algorithmic Game Theory
why are there either 1 ore infinitely many best responses?
As son as there are 2 best responses, you can linearly combine those responses with different weights on each response (as long as Sum(weights) = 1 ) to form new responses.
Algorithmic Game Theory
Pareto-Optimality
An outcome is Pareto-optimal if it is not Pareto-dominated.
An outcome is (weakly) Pareto-dominated if there exists another outcome in which all players obtain at least as much utility and one player is strictly better off.
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