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  • 1
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    Unknown
    Innsbruck: University of Innsbruck, Department of Public Finance
    Publication Date: 2018-11-23
    Description: This paper studies an evolutionary model of network formation with endogenous decay, in which agents benefit both from direct and indirect connections. In addition to forming (costly) links, agents choose actions for a coordination game that determines the level of decay of each link. We address the issues of coordination (long-run equilibrium selection) and network formation by means of stochastic stability techniques. We find that both the link cost and the trade-off between efficiency and risk-dominance play a crucial role in the long-run behavior of the system.
    Keywords: C72 ; C73 ; D83 ; D85 ; ddc:330 ; Coordination ; Networks ; Risk dominance ; stochastic stability ; Koordination ; Soziales Netzwerk ; Stochastischer Prozess ; Nichtkooperatives Spiel ; Evolutionäre Spieltheorie ; Theorie
    Language: English
    Type: doc-type:workingPaper
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  • 2
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    Unknown
    Bonn: Max Planck Institute for Research on Collective Goods
    Publication Date: 2019-10-22
    Description: The effectiveness of social interaction depends strongly on an ability to coordinate actions efficiently. In large networks, such coordination may be very difficult to achieve and may depend on the communication technology and the network structure. We examine how pre-play communication and clustering within networks affect coordination in a challenging experimental game on eight-person networks. Free-form chat is enormously effective in achieving the nonequilibrium efficient outcome in our game, but restricted communication (where subjects can only indicate their intended action) is almost entirely ineffective. We can rationalize this result with a novel model about the credibility of cheap-talk messages. This credibility is much larger with freeform message communication than with restricted communication. We are the first to model this credibility and show, both theoretically and experimentally, an interaction effect of network structure and communication technologies. We also provide a model of message diffusion, which indeed predicts that diffusion will be more rapid without clustering and is consistent with our data.
    Keywords: C71 ; C91 ; D03 ; D85 ; ddc:330 ; Networks ; Clustering ; Communication ; Credibility ; Cheap talk ; Experiment
    Language: English
    Type: doc-type:workingPaper
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  • 3
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    Unknown
    Munich: Center for Economic Studies and Ifo Institute (CESifo)
    Publication Date: 2019-08-22
    Description: The effectiveness of social interaction depends strongly on an ability to coordinate actions efficiently. In large networks, such coordination may be very difficult to achieve and may depend on the communication technology and the network structure. We examine how pre-play communication and clustering within networks affect coordination in a challenging experimental game on eight-person networks. Free-form chat is enormously effective in achieving the non-equilibrium efficient outcome in our game, but restricted communication (where subjects can only indicate their intended action) is almost entirely ineffective. We can rationalize this result with a novel model about the credibility of cheap-talk messages. This credibility is much larger with freeform message communication than with restricted communication. We are the first to model this credibility and show, both theoretically and experimentally, an interaction effect of network structure and communication technologies. We also provide a model of message diffusion, which indeed predicts that diffusion will be more rapid without clustering and is consistent with our data.
    Keywords: C71 ; C91 ; D03 ; D85 ; ddc:330 ; networks ; clustering ; communication ; credibility ; cheap talk ; experiment
    Language: English
    Type: doc-type:workingPaper
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  • 4
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    Unknown
    Bonn: Institute of Labor Economics (IZA)
    Publication Date: 2019-09-04
    Description: The effectiveness of social interaction depends strongly on an ability to coordinate actions efficiently. In large networks, such coordination may be very difficult to achieve and may depend on the communication technology and the network structure. We examine how pre-play communication and clustering within networks affect coordination in a challenging experimental game on eight-person networks. Free-form chat is enormously effective in achieving the nonequilibrium efficient outcome in our game, but restricted communication (where subjects can only indicate their intended action) is almost entirely ineffective. We can rationalize this result with a novel model about the credibility of cheap-talk messages. This credibility is much larger with freeform message communication than with restricted communication. We are the first to model this credibility and show, both theoretically and experimentally, an interaction effect of network structure and communication technologies. We also provide a model of message diffusion, which indeed predicts that diffusion will be more rapid without clustering and is consistent with our data.
    Keywords: C71 ; C91 ; D03 ; D85 ; ddc:330 ; networks ; clustering ; communication ; credibility ; cheap talk ; experiment
    Language: English
    Type: doc-type:workingPaper
    Location Call Number Limitation Availability
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  • 5
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    Unknown
    Basel: MDPI
    Publication Date: 2017-08-26
    Description: This paper considers a population of agents that are engaged in a listening network. The agents wish to match their actions to the true value of some uncertain (exogenous) parameter and to the actions of the other agents. Each agent begins with some initial information about the parameter and, in addition, is able to receive further information from their neighbors in the network. I derive a closed expression for the (interim) social welfare loss that depends on the initial information structure and on the possible pieces of information that can be gathered under the network. Then, I explore how changes in the network may affect social welfare for extreme levels of complementarity in the agents' actions. When the level of complementarity is very high, efficiency is achieved regardless of the network structure. For very low levels of complementarity in actions, efficiency can be either associated to more sparse or denser networks, depending on the size of the induced informative gains. The implications of this paper are relevant in security environments where agents are naturally interpreted as analysts who try to forecast the value of a parameter that describes a threat to security.
    Keywords: C72 ; D83 ; D84 ; D85 ; ddc:330 ; networks ; information aggregation ; beauty-contests ; strategic complementarity ; social welfare
    Language: English
    Type: doc-type:article
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  • 6
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    Unknown
    Bonn: Institute for the Study of Labor (IZA)
    Publication Date: 2018-11-15
    Description: In this paper, we describe a series of laboratory experiments that implement specific examples of a more general network structure and we examine equilibrium selection. Specifically, actions are either strategic substitutes or strategic complements, and participants have either complete or incomplete information about the structure of a random network. Since economic environments typically have a considerable degree of complementarity or substitutability, this framework applies to a wide variety of settings. The degree of equilibrium play is striking, in particular with incomplete information. Behavior closely resembles the theoretical equilibrium whenever this is unique; when there are multiple equilibria, general features of networks, such as connectivity, clustering, and the degree of the players, help to predict informed behavior in the lab. People appear to be strongly attracted to maximizing aggregate payoffs (social efficiency), but there are forces that moderate this attraction: 1) people seem content with (in the aggregate) capturing only the lion's share of the efficient profits in exchange for reduced exposure to loss, and 2) uncertainty about the network structure makes it considerably more difficult to coordinate on a demanding, but efficient, equilibrium that is typically implemented with complete information.
    Keywords: C71 ; C91 ; D03 ; D85 ; ddc:330 ; random networks ; incomplete information ; connectivity ; clustering ; strategic substitutes ; strategic complements ; experiment
    Language: English
    Type: doc-type:workingPaper
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  • 7
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    Unknown
    Innsbruck: University of Innsbruck, Research Platform Empirical and Experimental Economics (eeecon)
    Publication Date: 2018-11-23
    Description: In this paper, we describe a series of laboratory experiments that implement specific examples of a more general network structure and we examine equilibrium selection. Specifically, actions are either strategic substitutes or strategic complements, and participants have either complete or incomplete information about the structure of a random network. Since economic environments typically have a considerable degree of complementarity or substitutability, this framework applies to a wide variety of settings. The degree of equilibrium play is striking, in particular with incomplete information. Behavior closely resembles the theoretical equilibrium whenever this is unique; when there are multiple equilibria, general features of networks, such as connectivity, clustering, and the degree of the players, help to predict informed behavior in the lab. People appear to be strongly attracted to maximizing aggregate payoffs (social efficiency), but there are forces that moderate this attraction: 1) people seem content with (in the aggregate) capturing only the lion’s share of the efficient profits in exchange for reduced exposure to loss, and 2) uncertainty about the network structure makes it considerably more difficult to coordinate on a demanding, but efficient, equilibrium that is typically implemented with complete information.
    Keywords: C71 ; C91 ; D03 ; D85 ; ddc:330 ; Random networks ; Incomplete information ; Connectivity ; Clustering ; Strategic substitutes ; Strategic complements ; Experiment
    Language: English
    Type: doc-type:workingPaper
    Location Call Number Limitation Availability
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