{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T22:14:15Z","timestamp":1760220855503,"version":"build-2065373602"},"reference-count":56,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2013,12,10]],"date-time":"2013-12-10T00:00:00Z","timestamp":1386633600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Games"],"abstract":"<jats:p>Prompted by a real-life observation in the UK retail market, a two-player Prisoners\u2019 Dilemma model of an alliance between two firms is adapted to include the response of a rival firm, resulting in a version of a three-player Prisoners\u2019 Dilemma. We use this to analyse the impact on the stability of the alliance of the rival\u2019s competition, either with the alliance or with the individual partners. We show that, while strong external pressure on both partners can cause Ally-Ally to become a Nash equilibrium for the two-player Prisoners\u2019 Dilemma, weak or asymmetric pressure that plays on the partners\u2019 differing objectives can undermine the alliance. As well as providing new insights into how allies should respond if the alliance is to continue, this also illustrates how a third party can most effectively cause the alliance to become unsustainable. We create a new game theoretic framework, adding value to existing theory and the practice of alliance formation and sustainability.<\/jats:p>","DOI":"10.3390\/g4040754","type":"journal-article","created":{"date-parts":[[2013,12,10]],"date-time":"2013-12-10T12:32:12Z","timestamp":1386678732000},"page":"754-775","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["External Pressure on Alliances: What Does the Prisoners\u2019 Dilemma Reveal?"],"prefix":"10.3390","volume":"4","author":[{"given":"Jane","family":"Binner","sequence":"first","affiliation":[{"name":"Birmingham Business School, University House Edgbaston Park Road, Birmingham, B15 2TY, UK"}]},{"given":"Leslie","family":"Fletcher","sequence":"additional","affiliation":[{"name":"School of Computing and Mathematical Sciences, Liverpool John Moores University, James Parsons Liverpool L3 3AF, UK"}]},{"given":"Vassili","family":"Kolokoltsov","sequence":"additional","affiliation":[{"name":"Department of Statistics, Zeeman Building, University of Warwick, Coventry CV4 7AL, UK"}]},{"given":"Francesco","family":"Ciardiello","sequence":"additional","affiliation":[{"name":"Birmingham Business School, University House Edgbaston Park Road, Birmingham, B15 2TY, UK"}]}],"member":"1968","published-online":{"date-parts":[[2013,12,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1057","DOI":"10.1002\/smj.491","article-title":"Modeling alliance activity: An iterated Prisoners\u2019 Dilemma with exit option","volume":"26","author":"Arend","year":"2005","journal-title":"Strateg. 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