{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T16:25:04Z","timestamp":1768321504343,"version":"3.49.0"},"reference-count":80,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2024,4,18]],"date-time":"2024-04-18T00:00:00Z","timestamp":1713398400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001691","name":"JSPS KAKENHI","doi-asserted-by":"publisher","award":["JP23K21017"],"award-info":[{"award-number":["JP23K21017"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"JSPS KAKENHI","doi-asserted-by":"publisher","award":["JP21KK0027"],"award-info":[{"award-number":["JP21KK0027"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"JSPS KAKENHI","doi-asserted-by":"publisher","award":["JP23K25160"],"award-info":[{"award-number":["JP23K25160"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001691","name":"JSPS KAKENHI","doi-asserted-by":"publisher","award":["JP23K05943"],"award-info":[{"award-number":["JP23K05943"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Games"],"abstract":"<jats:p>Indirect reciprocity is one of the major mechanisms driving the evolution of cooperation in human societies. There are two types of indirect reciprocity: upstream and downstream reciprocity. Cooperation in downstream reciprocity follows the pattern \u2018You helped someone, and I will help you\u2019, while the direction of cooperation is reversed in upstream reciprocity, which follows the pattern \u2018You helped me, and I will help someone else\u2019. These two types of indirect reciprocity often occur in combination. However, upstream and downstream reciprocity have mostly been theoretically studied in isolation. In this study, we propose a new model that integrates both types of reciprocity. In particular, we apply the standard giving-game framework of indirect reciprocity and analyze the three-strategy model including reciprocal altruists, indiscriminate altruists, and free riders using evolutionary game theory. We show that the model allows reciprocal altruists and free riders to coexist stably in well-mixed populations. We also find that by accounting for inattention in the assessment rule, the stability of this mixed equilibrium can be strengthened to prevent the invasion of infamous indiscriminate altruists and can even be made globally stable.<\/jats:p>","DOI":"10.3390\/g15020015","type":"journal-article","created":{"date-parts":[[2024,4,18]],"date-time":"2024-04-18T10:30:52Z","timestamp":1713436252000},"page":"15","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["The Evolution of Cooperation and Diversity under Integrated Indirect Reciprocity"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4635-1389","authenticated-orcid":false,"given":"Tatsuya","family":"Sasaki","sequence":"first","affiliation":[{"name":"Department of Community Development, Koriyama Women\u2019s College, Fukushima 963-8503, Japan"}]},{"given":"Satoshi","family":"Uchida","sequence":"additional","affiliation":[{"name":"Research Center for Ethi-Culture Studies, RINRI Institute, Tokyo 102-8561, Japan"},{"name":"High-Tech Research Center, Kokushikan University, Tokyo 154-8515, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9943-2668","authenticated-orcid":false,"given":"Isamu","family":"Okada","sequence":"additional","affiliation":[{"name":"Department of Business Administration, Soka University, Tokyo 192-8577, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7966-2629","authenticated-orcid":false,"given":"Hitoshi","family":"Yamamoto","sequence":"additional","affiliation":[{"name":"Faculty of Business Administration, Rissho University, Tokyo 141-8602, Japan"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1086\/406755","article-title":"The evolution of reciprocal altruism","volume":"46","author":"Trivers","year":"1971","journal-title":"Q. 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