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This deployment across essentially independent agencies raises a natural question: what global impact does the resulting strategic interaction among the defenders, each using a similar model, have? We address this question in two ways. First, we demonstrate that the most common solution concept of Strong Stackelberg equilibrium (SSE) can result in significant under-investment in security entirely because SSE presupposes a single defender. Second, we propose a framework based on a different solution concept which incorporates a model of interdependencies among targets, and show that in this framework defenders tend to over-defend, even under significant positive externalities of increased defense.<\/jats:p>","DOI":"10.1145\/2627534.2627536","type":"journal-article","created":{"date-parts":[[2014,5,27]],"date-time":"2014-05-27T12:56:59Z","timestamp":1401195419000},"page":"4-7","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":13,"title":["MultiDefender security games on networks"],"prefix":"10.1145","volume":"41","author":[{"given":"Andrew","family":"Smith","sequence":"first","affiliation":[{"name":"Sandia National Laboratories, Livermore, CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yevgeniy","family":"Vorobeychik","sequence":"additional","affiliation":[{"name":"Sandia National Laboratories, Livermore, CA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joshua","family":"Letchford","sequence":"additional","affiliation":[{"name":"Sandia National Laboratories, Livermore, CA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2014,4,17]]},"reference":[{"key":"e_1_2_1_1_1","unstructured":"Yoram Bachrach Moez Draief and Sanjeev Goyal. 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