Optimism and pessimism in strategic interactions under

• 成果类型: Article
• 署名作者: Guarino, Pierfrancesco; Ziegler, Gabriel
• 署名单位: University of Udine; University of Edinburgh; Pennsylvania Commonwealth System of Higher Education (PCSHE); University of Pittsburgh
• 刊物名称: GAMES AND ECONOMIC BEHAVIOR
• ISSN/ISSBN: 0899-8256
• DOI: 10.1016/j.geb.2022.10.012
• 发表日期: 2022
• 页码: 559-585
• 关键词: Ignorance; optimism; pessimism; point; Wald Rationalizability; interactive epistemology; Wishful thinking; B?rgers dominance

摘要

We study players interacting under the veil of ignorance, who have-coarse-beliefs represented as subsets of opponents' actions. We analyze when these players follow max min or max max decision criteria, which we identify with pessimistic or optimistic attitudes, respectively. Explicitly formalizing these attitudes and how players reason interactively under ignorance, we characterize the behavioral implications related to common belief in these events: while optimism is related to Point Rationalizability, a new algorithm-Wald Rationalizability-captures pessimism. Our characterizations allow us to uncover novel results: (i) regarding optimism, we relate it to wishful thinking a la Yildiz (2007) and we prove that dropping the (implicit) belief-implies-truth assumption reverses an existence failure described therein; (ii) we shed light on the notion of rationality in ordinal games; (iii) we clarify the conceptual underpinnings behind a discontinuity in Rationalizability hinted in the analysis of Weinstein (2016).(c) 2022 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).