Appearances can be deceiving: Lessons learned re-implementing Axelrod's `evolutionary approach to norms'

Authored by JM Galan, LR Izquierdo

Date Published: 2005-06

Sponsors: Spanish Ministry of Science and Innovation (MICINN)

Platforms: Repast

Model Documentation: Other Narrative Flow charts Mathematical description

Model Code URLs: http://www.insisoc.org/metanorms/

Abstract

In this paper we try to replicate the simulation results reported by Axelrod (1986) in an influential paper on the evolution of social norms. Our study shows that Axelrod's results are not as reliable as one would desire. We can obtain the opposite results by running the model for longer, by slightly modifying some of the parameters, or by changing some arbitrary assumptions in the model. This re-implementation exercise illustrates the importance of running stochastic simulations several times for many periods, exploring the parameter space adequately, complementing simulation with analytical work, and being aware of the scope of our simulation models.

Tags

Agent-based modelling Replication Norms Evolutionary game theory metanorms social dilemmas