プレッジ駆動型意地悪:最後通牒ゲームにおける不連続相転移
Arunava Patra1, C F Sagar Zephania1, Sagar Chakraborty1
1Indian Institute of Technology Kanpur, Department of Physics, Uttar Pradesh 208016, India.
Physical review. E
|December 23, 2025
まとめ
偏見の強度が社会的な差別を促進する。最後通牒ゲームでは、プレイヤーの高い偏見(偏見度)が、特に大規模な集団において、意地悪な行動が優位な戦略として現れる原因となる。
科学分野:
- 行動経済学
- 進化ゲーム理論
- 社会心理学
背景:
- 社会的な偏見は、個人の偏見に起因する場合がある。
- 戦略的な相互作用は、個人の偏見を増幅させる可能性がある。
- 差別は、不公平または意地悪な行動として現れることがある。
研究 の 目的:
- 個人の偏見が戦略的相互作用において社会的な偏見にどのように影響するかを調査すること。
- 最後通牒ゲームの枠組みの中で「偏見度」を導入し、分析すること。
- 偏見によって引き起こされる意地悪な行動の出現を探求すること。
主な方法:
- 古典的な最後通牒ゲームの理論的修正。
- プレイヤーレベルの偏見強度(「偏見度」)の導入。
- 確率的進化ゲームダイナミクス(複製-選択)と決定論的複製子ダイナミクスを用いた分析。
主要な成果:
- 最初の相転移が観察され、意地悪な行動が優位になった。
- 意地悪な行動は、閾値となる偏見度の値で不連続に出現した。
- この意地悪の出現は、特に大規模な集団や長期的なダイナミクスにおいて頑健である。
結論:
- 個人の偏見強度は、社会的な結果に大きく影響し、意地悪を促進する。
- 最後通牒ゲームのモデルは、偏見度と意地悪の進化との間に明確な関連性を示す。
- この発見は、偏見が差別的で有害な社会的行動を促進する可能性を強調している。
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