Published online by Cambridge University Press: 14 March 2025
Agent-based simulations and human-subject experiments explore the emergence of respect for property in a specialization and exchange economy with costless theft. Software agents, driven by reciprocity and hill-climbing heuristics and parameterized to replicate humans when property is exogenously protected, are employed to predict human behavior when property can be freely appropriated. Agents do not predict human behavior in a new set of experiments because subjects innovate, constructing a property convention of “mutual taking” in 5 out of the 6 experimental sessions that allows exchange to crowd out theft. When the same convention is made available to agents, they adopt it and again replicate human behavior. Property emerges as a social convention that exploits the capacity for reciprocity to sustain trade.
Data, simulation code, and CSW experiment instructions available upon request. All simulations, data analysis, and figures were performed or created in R: A language and Environment for Statistical Computing (R Development Core Team 2010) with assistance from various contributed packages including: Bengtsson (2003), Berkelaar et al. (2008), Henningsen (2008), Neuwirth (2007), and Warnes et al. (2008).
Electronic supplementary material The online version of this article (doi:10.1007/s10683-010-9258-0) contains supplementary material, which is available to authorized users.