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If all players can be matched this way, preferences are IMS\u2010complete. A mechanism is a soulmate mechanism if it allows the formation of all soulmate coalitions. Our model follows Banerjee, Konishi, and S\u00f6nmez, except reported preferences are strategic variables. We investigate the incentive and stability properties of soulmate mechanisms. In contrast to prior literature, we do not impose conditions that ensure IMS\u2010completeness. A fundamental result is that, (1) any group of players who could change their reported preferences and mutually benefit does not contain any players who were matched as soulmates and reported their preferences truthfully. As corollaries, (2) for any IMS\u2010complete profile, soulmate mechanisms have a truthful strong Nash equilibrium, and (3) as long as all players matched as soulmates report their preferences truthfully, there is no incentive for any to deviate. Moreover, (4) soulmate coalitions are invariant core coalitions\u2014that is, any soulmate coalition will be a coalition in every outcome in the core. To accompany our theoretical results, we present real\u2010world data analysis and simulations that highlight the prevalence of situations in which many, but not all, players can be matched as soulmates. In the Appendix\u00a0we relate IMS to other well\u2010known coalition formation processes.<\/jats:p>","DOI":"10.1111\/jpet.12542","type":"journal-article","created":{"date-parts":[[2021,9,15]],"date-time":"2021-09-15T07:41:42Z","timestamp":1631691702000},"page":"822-857","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Matching soulmates"],"prefix":"10.1111","volume":"23","author":[{"given":"Greg","family":"Leo","sequence":"first","affiliation":[{"name":"Department of Economics Vanderbilt University  Nashville Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jian","family":"Lou","sequence":"additional","affiliation":[{"name":"Department of Electrical Engineering and Computer Science Vanderbilt University  Nashville Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martin","family":"Van der Linden","sequence":"additional","affiliation":[{"name":"Department of Quantitative Theory and Methods Emory University  Atlanta Georgia USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yevgeniy","family":"Vorobeychik","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Engineering Washington University  St. Louis Missouri USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Myrna","family":"Wooders","sequence":"additional","affiliation":[{"name":"Department of Economics Vanderbilt University  Nashville Tennessee USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,9,15]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1257\/000282803322157061"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00355-006-0123-1"},{"key":"e_1_2_10_4_1","first-page":"287","article-title":"Acceptable points in general cooperative n\u2010person games","volume":"4","author":"Aumann R. 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