5. Discussion and conclusions
Prior research on the BMs of sustainable organizations has focused on identifying various sustainability archetypes (Bocken et al., 2014; Bohnsack et al., 2014; Rosca et al., 2016). In this study, we explore the variations in environmental and social sustainability within BMs by applying a boundary-spanning perspective on the BM and using the corresponding BM content, structure, and governance properties to map the BMs of 64 innovative sustainable organizations (Amit and Zott, 2001; Zott et al., 2011). This perspective allowed us to complement previous studies on sustainability archetypes by demonstrating that there is substantial heterogeneity in how exactly the value transfers between the focal organization and the other actors are structured in different sustainability-oriented BMs. Such value transfers are not necessarily symmetric, i.e. a bi-directional exchange is not always taking place. As such, this study makes five key contributions. First, our inductive coding resulted in five generic BM structures that, alone or in combination, are used by sustainable organizations. All of these five BM structure patterns can be linked to wellknown examples of conventional firms (see Table 3). Hence, we find that the uniqueness of BMs for sustainability has been somewhat exaggerated as all of our cases can be categorized using the generic BM structure patterns. Nevertheless, further research is desirable, since our research set-up did not focus on the comparison between sustainable and conventional organizations.