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  • January 2011
  • Article
  • American Naturalist

Let the Right One In: A Microeconomic Approach to Partner Choice in Mutualisms

By: Marco Archetti, Francisco Ubeda, Drew Fudenberg, Jerry R. Green, Naomi E. Pierce and Douglas W. Yu
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Abstract

One of the main problems impeding the evolution of cooperation is partner choice. When information is asymmetric (the quality of a potential partner is known only to himself), it may seem that partner choice is not possible without signaling. Many mutualisms, however, exist without signaling, and the mechanisms by which hosts might select the right partners are unclear. Here we propose a general mechanism of partner choice, "screening," that is similar to the economic theory of mechanism design. Imposing the appropriate costs and rewards may induce the informed individuals to screen themselves according to their types and therefore allow a noninformed individual to establish associations with the correct partners in the absence of signaling. Several types of biological symbioses are good candidates for screening, including bobtail squid, ant-plants, gut microbiomes, and many animal and plant species that produce reactive oxygen species. We describe a series of diagnostic tests for screening. Screening games can apply to the cases where by-products, partner fidelity feedback, or host sanctions do not apply, therefore explaining the evolution of mutualism in systems where it is impossible for potential symbionts to signal their cooperativeness beforehand and where the host does not punish symbiont misbehavior.

Keywords

Microeconomics; Strategy; Partners And Partnerships; System; Problems And Challenges; Information; Economics; Theory; Cost; Decision Choices And Conditions; Cooperation

Citation

Archetti, Marco, Francisco Ubeda, Drew Fudenberg, Jerry R. Green, Naomi E. Pierce, and Douglas W. Yu. "Let the Right One In: A Microeconomic Approach to Partner Choice in Mutualisms." American Naturalist 177, no. 1 (January 2011).
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About The Author

Jerry R. Green

Negotiation, Organizations & Markets
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More from the Authors
  • Assent-maximizing Social Choice By: Katherine A. Baldiga and Jerry R. Green
  • Choice-based Measures of Conflict in Preferences By: Katherine Baldiga and Jerry R. Green
  • On the General Relativity of Fiscal Language By: Jerry R. Green and Lawrence Kotlikoff
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