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Previous contributions have focused on the case of perfectly competitive buyers and sellers of gas, which allows to replace the respective market equilibrium problem by a single welfare maximization problem. Our novel framework considers the mathematically more challenging case of a monopolistic and thus strategic gas seller. In this framework, the objective functions of the gas sellers and buyers cannot be aggregated into a common objective function, which is why a multilevel formulation is necessary to accurately capture the sequential nature of the decisions taken. For this setup, we derive sufficient conditions that allow for reformulating the challenging four-level model as a computationally tractable single-level reformulation. We prove the correctness of this reformulation and use it for solving several test instances to illustrate the applicability of our approach.<\/jats:p>","DOI":"10.1007\/s10898-025-01475-8","type":"journal-article","created":{"date-parts":[[2025,3,22]],"date-time":"2025-03-22T22:46:46Z","timestamp":1742683606000},"page":"953-985","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["On a tractable single-level reformulation of a multilevel model of the European entry-exit gas market with market power"],"prefix":"10.1007","volume":"91","author":[{"given":"Veronika","family":"Grimm","sequence":"first","affiliation":[]},{"given":"Julia","family":"Gr\u00fcbel","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6208-5677","authenticated-orcid":false,"given":"Martin","family":"Schmidt","sequence":"additional","affiliation":[]},{"given":"Alexandra","family":"Schwartz","sequence":"additional","affiliation":[]},{"given":"Ann-Kathrin","family":"Wiertz","sequence":"additional","affiliation":[]},{"given":"Gregor","family":"Z\u00f6ttl","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2025,3,22]]},"reference":[{"issue":"4","key":"1475_CR1","doi-asserted-by":"publisher","first-page":"1601","DOI":"10.1257\/aer.100.4.1601","volume":"100","author":"I Aguirre","year":"2010","unstructured":"Aguirre, I., Cowan, S., Vickers, J.: Monopoly price discrimination and demand curvature. 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