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Related Experiment Video

Updated: Jul 6, 2026

The HoneyComb Paradigm for Research on Collective Human Behavior

The HoneyComb Paradigm for Research on Collective Human Behavior

Published on: January 19, 2019

Spies in the minority game.

You-Yang Yu¹, Chen Xu, Guo-Qing Gu

¹School of Information Science and Technology, East China Normal University, Shanghai 200062, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 21, 2008

Summary

Introducing spies into the minority game (MG) shows their actions impact agent success. Few spies benefit from information, but many spies hinder their own success, aiding normal agents instead.

Area of Science:

Complex Systems
Game Theory
Agent-Based Modeling

Background:

The minority game (MG) involves agents choosing between two actions, aiming to be in the minority.
Normal agents in the MG employ strategies to predict and exploit collective behavior.
The introduction of 'spies' presents a novel dynamic, as they do not use strategies but mimic observed actions.

Purpose of the Study:

To investigate the impact of spy agents on the performance and success rates within the minority game.
To analyze how the fraction of spies influences the overall population's success and the individual success of normal agents.
To understand the emergent behaviors and non-monotonic dynamics introduced by spies in the MG.

Main Methods:

Agent-based simulation of the minority game with varying proportions of spy agents.

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Analysis of success rates for both spy and normal agents under different information availability scenarios.

Quantification of the 'crowd effect' and its influence on agent decision-making and outcomes.

Main Results:

A small number of spies can achieve high success rates by leveraging information from normal agents.
As the spy population increases, their collective behavior amplifies the crowd effect, reducing their individual success.
Increased spy presence can paradoxically improve normal agents' success rates by creating more winning opportunities.
The total success rate exhibits non-monotonic behavior concerning the fraction of spies.

Conclusions:

Spies introduce complex, non-linear dynamics into the minority game, altering traditional strategy-based outcomes.
The effectiveness of spies is highly dependent on their proportion and the quality of information available in the agent population.
The study highlights how introducing non-strategic agents can lead to emergent collective behaviors and shifts in overall system performance.