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Communication and common interest.

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Summary
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Common interest between communicating agents can maintain honest signaling even without signal costs. Increased common interest enhances the likelihood of informative signaling in various scenarios.

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Area of Science:

  • Behavioral biology
  • Game theory
  • Computational methods

Background:

  • Maintaining honest communication is crucial when agents have conflicting interests.
  • Signal costs are traditionally viewed as necessary for honesty in signaling games.
  • Divergent interests can incentivize deception, information concealment, or exaggeration.

Purpose of the Study:

  • To investigate the role of common interest in enabling cost-free informative signaling.
  • To define and quantify measures of common interest between senders and receivers.
  • To explore how common interest influences the stability of informative signaling equilibria.

Main Methods:

  • Utilized novel computational methods to analyze signaling games.
  • Defined two quantitative measures of common interest based on preference divergence.
  • Sampled a large parameter space of signaling games to identify patterns.

Main Results:

  • Informative signaling is possible at equilibrium even with zero common interest.
  • Games with zero common interest supporting informative signaling are rare.
  • The proportion of games with informative signaling equilibria increases with common interest.

Conclusions:

  • Common interest is a significant predictor of informative signaling.
  • The relationship between common interest and informative signaling is influenced by state-dependent preferences.
  • Findings offer a quantitative framework for understanding signaling dynamics in diverse systems.