6 papers
A model of local and global reciprocity
Mari Kawakatsu, Yohsuke Murase, Taylor A. Kessinger +1
We often decide how to treat friends based on observations of their past behavior, whereas actions toward strangers are typically guided by their public reputations. These two kind…
Hyperedge approximation for stochastic processes on higher-order networks
Anzhi Sheng, Alex McAvoy, Ye Tian +3
Graphs are a standard framework for describing dynamical processes shaped by pairwise interactions among agents. But many systems involve interactions in groups of three or more ag…
Generative artificial intelligence reduces social welfare through model collapse
Fabian Baumann, Erol Akçay, Joshua B. Plotkin
Generative artificial intelligence (genAI) is rapidly reshaping how knowledge and culture are produced and consumed. Yet generative models are vulnerable to model collapse: when tr…
The Evolution of Trust under Institutional Moral Hazard
Hiroaki Chiba-Okabe, Joshua B. Plotkin
We study the behavior of for-profit institutions that broadcast reputations to foster trust among market participants. We develop a theoretical model in which buyers and sellers ar…
Evolution of social behaviors in noisy environments
Guocheng Wang, Qi Su, Long Wang +1
Evolutionary game theory offers a general framework to study how behaviors evolve by social learning in a population. This body of theory can accommodate a range of social dilemmas…
When it pays to teach: a population threshold for dedicated teaching
Hirotaka Goto, Joshua B. Plotkin
Teachers hold a prominent place in modern societies, particularly where education is compulsory and widely institutionalized. This ubiquity obscures an underlying question: why do…