{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,22]],"date-time":"2025-10-22T23:37:33Z","timestamp":1761176253579,"version":"build-2065373602"},"reference-count":0,"publisher":"IOS Press","isbn-type":[{"value":"9781643686318","type":"electronic"}],"license":[{"start":{"date-parts":[[2025,10,21]],"date-time":"2025-10-21T00:00:00Z","timestamp":1761004800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,10,21]]},"abstract":"<jats:p>An electoral spoiler is usually defined as a losing candidate whose removal would affect the outcome by changing the winner. So far, spoiler effects have been analyzed primarily for single-winner electoral systems. We consider this subject in the context of party elections, where there is no longer a sharp distinction between winners and losers. Hence, we propose a more general definition, under which a party is a spoiler if their elimination causes any other party\u2019s share in the outcome to decrease. We characterize spoiler-proof electoral allocation rules for zero-sum voting methods. In particular, we prove that for seats-votes functions only identity is spoiler-proof. However, even if spoilers are unavoidable under common electoral rules, their expected impact can vary depending on the rule. Hence, we introduce a measure of spoilership, which allows us to experimentally compare a number of multiwinner social choice rules according to their spoiler susceptibility. Since the probabilistic models used in COMSOC have been developed for nonparty elections, we extend them to generate multi-district party elections.<\/jats:p>","DOI":"10.3233\/faia251258","type":"book-chapter","created":{"date-parts":[[2025,10,22]],"date-time":"2025-10-22T09:56:10Z","timestamp":1761126970000},"source":"Crossref","is-referenced-by-count":0,"title":["Spoiler Susceptibility in Party Elections"],"prefix":"10.3233","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3299-7071","authenticated-orcid":false,"given":"Daria","family":"Boratyn","sequence":"first","affiliation":[{"name":"Jagiellonian University, Center for Quantitative Political Science, Krak\u00f3w, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2388-8930","authenticated-orcid":false,"given":"Wojciech","family":"S\u0142omczy\u0144ski","sequence":"additional","affiliation":[{"name":"Jagiellonian University, Center for Quantitative Political Science, Krak\u00f3w, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8295-0848","authenticated-orcid":false,"given":"Dariusz","family":"Stolicki","sequence":"additional","affiliation":[{"name":"Jagiellonian University, Center for Quantitative Political Science, Krak\u00f3w, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6301-6227","authenticated-orcid":false,"given":"Stanis\u0142aw","family":"Szufa","sequence":"additional","affiliation":[{"name":"CNRS, LAMSADE, Universit\u00e9 Paris Dauphine \u2013 PSL, Paris, France"},{"name":"AGH University, Krak\u00f3w, Poland"}]}],"member":"7437","container-title":["Frontiers in Artificial Intelligence and Applications","ECAI 2025"],"original-title":[],"link":[{"URL":"https:\/\/ebooks.iospress.nl\/pdf\/doi\/10.3233\/FAIA251258","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,22]],"date-time":"2025-10-22T09:56:10Z","timestamp":1761126970000},"score":1,"resource":{"primary":{"URL":"https:\/\/ebooks.iospress.nl\/doi\/10.3233\/FAIA251258"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,10,21]]},"ISBN":["9781643686318"],"references-count":0,"URL":"https:\/\/doi.org\/10.3233\/faia251258","relation":{},"ISSN":["0922-6389","1879-8314"],"issn-type":[{"value":"0922-6389","type":"print"},{"value":"1879-8314","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,10,21]]}}}