貧困がリスクテイクに及ぼす逆説的な影響の説明:絶望閾値モデル
Benoît de Courson1,2,3, Willem E Frankenhuis2,4, Daniel Nettle1,5
1Institut Jean Nicod, Département d'études cognitives, Ecole Normale Supérieure-PSL, EHESS, CNRS, Paris, France.
The Behavioral and brain sciences
|February 23, 2026
まとめ
貧困
科学分野:
- 行動経済学
- 意思決定科学
- 社会学
背景:
- 貧困が意思決定に及ぼす影響については議論があり、リスク回避行動とリスクテイク行動の両方を示す研究がある。
- 既存のモデルでは、これらの逆説的な発見を完全には調和させることができない。
研究 の 目的:
- 逆説的な貧困関連の意思決定を説明する絶望閾値モデル(DTM)を導入および検証する。
- 希少性下でのリスク選好に関する矛盾する経験的証拠を調和させる。
主な方法:
- 物質的資源に対するS字型の効用関数に基づいた理想化された合理的選択モデル(DTM)を開発した。
- DTMを支持するために、多様な社会文脈からの経験的証拠をレビューした。
- 個人の意思決定を不平等や福祉政策などの社会問題に結び付けた。
主要な成果:
- DTMは、基本的なニーズがほぼ満たされている場合にはリスク回避を予測するが、閾値をはるかに下回る場合にはリスクテイクを予測する。
- S字型の効用関数は、希少性によって資源の知覚価値がどのように変化するかを説明する。
- このモデルは、生物学、人類学、経済学、心理学からの知見を統合する。
結論:
- 絶望閾値モデル(DTM)は、リスクテイキングに対する貧困の影響を理解するための統一されたフレームワークを提供する。
- このモデルは、経済的不平等、犯罪抑止、福祉国家設計に影響を与える。
- DTMを洗練および適用するためには、さらなる学際的な研究が必要である。
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