The aim of this paper is to advance research on sustainable innovation by adopting a business model perspective. Through a confrontation of the literature on both topics we find that research on sustainable innovation has tended to neglect the way in which firms need to combine a value proposition, the organization of the upstream and downstream value chain, and a financial model, in order to bring sustainability innovations to the market. Therefore, we review the current literature on business models in the contexts of technological, organizational, and social sustainability innovations. As the current literature does not offer a general conceptual definition of sustainable business models, we propose examples of normative "boundary conditions" that business models should meet in order to support sustainable innovations. Finally, we sketch the outline of a research agenda by formulating a number of guiding questions.

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Summary The circular economy (CE) requires companies to rethink their supply chains and business models. Several frameworks found in the academic and practitioner literature propose circular economy business models (CEBMs) to redefine how companies create value while adhering to CE principles. A review of these frameworks shows that some models are frequently discussed, some are framework specific, and some use a different wording to refer to similar CEBMs, pointing to the need to consolidate the current state of the art. We conduct a morphological analysis of 26 current CEBMs from the literature, which includes defining their major business model dimensions and identifying the specific characteristics of these dimensions. Based on this analysis, we identify a broad range of business model design options and propose six major CEBM patterns with the potential to support the closing of resource flows: repair and maintenance; reuse and redistribution; refurbishment and remanufacturing; recycling; cascading and repurposing; and organic feedstock business model patterns. We also discuss different design strategies to support the development of these CEBMs.

The relevance of business models for corporate performance in general and corporate sustainability in particular has been widely acknowledged in the literature while sustainable entrepreneurship research has started to explore contributions to the sustainability transformation of markets and society. Particularities of the business models of sustainable niche market pioneers have been identified in earlier research, but little is known about the dynamic role of business models for sustainable entrepreneurship processes aiming at upscaling ecologically and socially beneficial niche models or sustainability upgrading of conventional mass market players. Informed by evolutionary economics, we develop a theoretical framework to analyze co-evolutionary business model development for sustainable niche pioneers and conventional mass market players aiming at the sustainability transformation of markets. Core evolutionary processes of business model variation, selection and retention, and evolutionary pathways are identified to support structured analyses of the dynamics between business model innovation and sustainability transformation of markets.