“…The literature has suggested several mechanisms to motivate a SIB effect, like greater effectiveness through better provider contracts (Dayson, Fraser, & Lowe, 2020; FitzGerald, Rosenbach, Hameed, Dixon, & Blundell, 2021; Heinrich & Kabourek, 2019; Maier, Barbetta, & Godina, 2018) and inter‐organizational collaboration (Leventhal, 2012) across public, private, and philanthropic partners (Fox & Albertson, 2011, 2012; Joy & Shields, 2013). Despite the relevance of this SIB effect, there has been no quantitative estimate to date (Edmiston & Nicholls, 2018; Tan, Fraser, McHugh, & Warner, 2021); only program effects have been estimated (Anders & Dorsett, 2017).…”