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Optimism leads to optimality: Ambiguity in network formation

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  • Bayer, Peter
  • Guerdjikova, Ani

Abstract

We analyze a model of endogenous two-sided network formation where players are affected by uncertainty in their opponents' decisions. We model this uncertainty using the notion of equilibrium under ambiguity (Eichberger and Kelsey, 2014). Unlike the set of Nash equilibria, the set of equilibria under ambiguity does not always include underconnected and thus inefficient networks such as the empty network. On the other hand, it may include networks with unreciprocated, one-way links, which comes with an efficiency loss as linking efforts are costly. We characterize equilibria under ambiguity and provide conditions under which increased player optimism comes with an increase in efficiency in equilibrium. Next, we analyze the dynamic situation with one-sided, myopic updating with regular optimistic shocks and derive a global stability condition of benefit-maximizing equilibrium networks.

Suggested Citation

  • Bayer, Peter & Guerdjikova, Ani, 2021. "Optimism leads to optimality: Ambiguity in network formation," VfS Annual Conference 2021 (Virtual Conference): Climate Economics 242439, Verein für Socialpolitik / German Economic Association.
    • Handle: RePEc:zbw:vfsc21:242439
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    More about this item

    JEL classification:

    • D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness

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