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In many real\u2010world occasions, however, the processes have two\u2010 or multi\u2010stage structures with or without shared resources. Two\u2010stage DEA models deal with the calculation of the technical efficiency of a system, taking into consideration its internal structures. In this contribution, we consider a two\u2010stage production process in which both stages are fed by shared resources, and there are undesirable products from the second stage. In the model we will propose, an optimal split on shared resources is given. To demonstrate the applicability of the proposed approach, data on 40 bank branches in seven years 2014\u20132020 is presented. In our real application in the banking sector, we find out that the most important sources of inefficiency of bank branches are related to interest revenue and overdue debt (undesirable output). Moreover, we saw that almost all branches were inefficient in the second stage (sale and service section) in all the seven years of evaluation.<\/jats:p>","DOI":"10.1111\/itor.13454","type":"journal-article","created":{"date-parts":[[2024,3,22]],"date-time":"2024-03-22T08:24:49Z","timestamp":1711095889000},"page":"2453-2473","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Efficiency analysis in two\u2010stage data envelopment analysis with shared resources and undesirable outputs: an application in the banking sector"],"prefix":"10.1111","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4160-8509","authenticated-orcid":false,"given":"Alireza","family":"Amirteimoori","sequence":"first","affiliation":[{"name":"Faculty of Engineering and Natural Sciences Istinye University  Istanbul Turkey"}]}],"member":"311","published-online":{"date-parts":[[2024,3,22]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.omega.2011.02.009"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/itor.13284"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1186\/s40854-022-00447-1"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.dajour.2022.100115"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbankfin.2010.02.023"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1287\/mnsc.30.9.1078"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10479-008-0414-2"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/0377-2217(78)90138-8"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/nav.3800090303"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejor.2009.05.012"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ejor.2012.11.021"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.omega.2009.12.001"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-0-387-45283-8"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40747-020-00211-x"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1051\/ro\/2018075"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.seps.2007.07.002"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.seps.2017.01.008"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.2307\/1928055"},{"key":"e_1_2_8_20_1","unstructured":"F\u00e4re R. 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