378,586 research outputs found
Information Sharing Games
In this paper we study information sharing situations.For every information sharing situation we construct an associated cooperative game, which we call an information sharing game.We show that the class of information sharing games co-incides with the class of cooperative games with a population monotonic allocation scheme.game theory
Information Sharing Games
In this paper we study information sharing situations.For every information sharing situation we construct an associated cooperative game, which we call an information sharing game.We show that the class of information sharing games co-incides with the class of cooperative games with a population monotonic allocation scheme.
Cooperative Games arising from Information Sharing Situations
Relations are established between information sharing (IS) situations and IS-games on one hand and information collecting (IC) situations and IC-games on the other hand. It is shown that IC-games can be obtained as convex combinations of so-called local games. Properties are described which IC-games possess if all related local games have the respective properties. Special attention is paid to the classes of convex IC-games and of k-concave IC-games. This last class turns out to consist of total big boss games. For the class of total big boss games a new solution concept is introduced: bi-monotonic allocation schemes.cooperative games;information;big boss games;bi-monotonic allocation scheme
Sharing Non-Anonymous Costs of Multiple Resources Optimally
In cost sharing games, the existence and efficiency of pure Nash equilibria
fundamentally depends on the method that is used to share the resources' costs.
We consider a general class of resource allocation problems in which a set of
resources is used by a heterogeneous set of selfish users. The cost of a
resource is a (non-decreasing) function of the set of its users. Under the
assumption that the costs of the resources are shared by uniform cost sharing
protocols, i.e., protocols that use only local information of the resource's
cost structure and its users to determine the cost shares, we exactly quantify
the inefficiency of the resulting pure Nash equilibria. Specifically, we show
tight bounds on prices of stability and anarchy for games with only submodular
and only supermodular cost functions, respectively, and an asymptotically tight
bound for games with arbitrary set-functions. While all our upper bounds are
attained for the well-known Shapley cost sharing protocol, our lower bounds
hold for arbitrary uniform cost sharing protocols and are even valid for games
with anonymous costs, i.e., games in which the cost of each resource only
depends on the cardinality of the set of its users
Correlated Equilibria, Incomplete Information and Coalitional Deviations
This paper proposes new concepts of strong and coalition-proof correlated equilibria where agents form coalitions at the interim stage and share information about their recommendations in a credible way. When players deviate at the interim stage, coalition-proof correlated equilibria may fail to exist for two-player games. However, coalition- proof correlated equilibria always exist in dominance-solvable games and in games with positive externalities and binary actions.correlated equilibrium ; coalitions ; information sharing ; games with positive externalities
Competition in Wireless Systems via Bayesian Interference Games
We study competition between wireless devices with incomplete information
about their opponents. We model such interactions as Bayesian interference
games. Each wireless device selects a power profile over the entire available
bandwidth to maximize its data rate. Such competitive models represent
situations in which several wireless devices share spectrum without any central
authority or coordinated protocol.
In contrast to games where devices have complete information about their
opponents, we consider scenarios where the devices are unaware of the
interference they cause to other devices. Such games, which are modeled as
Bayesian games, can exhibit significantly different equilibria. We first
consider a simple scenario of simultaneous move games, where we show that the
unique Bayes-Nash equilibrium is where both devices spread their power equally
across the entire bandwidth. We then extend this model to a two-tiered spectrum
sharing case where users act sequentially. Here one of the devices, called the
primary user, is the owner of the spectrum and it selects its power profile
first. The second device (called the secondary user) then responds by choosing
a power profile to maximize its Shannon capacity. In such sequential move
games, we show that there exist equilibria in which the primary user obtains a
higher data rate by using only a part of the bandwidth.
In a repeated Bayesian interference game, we show the existence of reputation
effects: an informed primary user can bluff to prevent spectrum usage by a
secondary user who suffers from lack of information about the channel gains.
The resulting equilibrium can be highly inefficient, suggesting that
competitive spectrum sharing is highly suboptimal.Comment: 30 pages, 3 figure
Information sharing promotes prosocial behaviour
More often than not, bad decisions are bad regardless of where
and when they are made. Information sharing might thus be utilized to
mitigate them. Here we show that sharing information about strategy choice
between players residing on two different networks reinforces the evolution
of cooperation. In evolutionary games, the strategy reflects the action of each
individual that warrants the highest utility in a competitive setting. We therefore
assume that identical strategies on the two networks reinforce themselves by
lessening their propensity to change. Besides network reciprocity working in
favour of cooperation on each individual network, we observe the spontaneous
emergence of correlated behaviour between the two networks, which further
deters defection. If information is shared not just between individuals but also
between groups, the positive effect is even stronger, and this despite the fact
that information sharing is implemented without any assumptions with regard to
content
Sequential bargaining with pure common values and incomplete information on both sides
We study the alternating-offer bargaining problem of sharing a common value pie under incomplete information on both sides and no depreciation between two identical players. We characterise the essentially unique perfect Bayesian equilibrium of this game which turns out to be in gradually increasing offers.Gradual bargaining; Common values; Incomplete information; Repeated games
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