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Nonlinear effects of group size on collective action and resource outcomes

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June 14, 2013 - Author: , Wei Liu, Andrés Viña, Mao-Ning Tuanmu, Guangming He, , and Jianguo Liu

Journal or Book Title: PNAS

Keywords: casual inference; commons governance; ecosystem services; biodiversity conservation; sustainability

Year Published: 2013

For decades, scholars have been trying to determine whether small or large groups are more likely to cooperate for collective action and successfully manage common-pool resources. Using data gathered from the Wolong Nature Reserve since 1995, we examined the effects of group size (i.e., number of households monitoring a single forest parcel) on both collective action (forest monitoring) and resource outcomes (changes in forest cover) while controlling for potential confounding factors. Our results demonstrate that group size has nonlinear effects on both collective action and resource outcomes, with intermediate group size contributing the most monitoring effort and leading to the biggest forest cover gain. We also show how opposing effects of group size directly and indirectly affect collective action and resource outcomes, leading to the overall nonlinear relationship. Our findings suggest why previous studies have observed differing and even contradictory group-size effects, and thus help guide further research and governance of the commons. The findings also suggest that it should be possible to improve collective action and resource outcomes by altering factors that lead to the nonlinear group-size effect, including punishing free riding, enhancing overall and within-group enforcement, improving social capital across groups and among group members, and allowing self-selection during the group formation process so members with good social relationships can form groups autonomously.

DOI: doi/10.1073/pnas.1301733110

Type of Publication: Journal Article

Editor(s): Bonnie J. McCay, Rutgers, State University

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Tags: biodiversity conservation, casual inference, commons governance, ecosystem services, sustainability


Authors

Jianguo

Jianguo "Jack" Liu
517-432-5025
liuji@msu.edu

Wu Yang

Wu Yang

Andres Vina

Andres Vina
vina@msu.edu

Thomas Dietz

Thomas Dietz
517-353-8763
tdietz@msu.edu


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