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In times of climate change, biodiversity loss, or growing natural resource scarcity, the circular business model (CBM) concept is increasingly attractive, promoting the reorganization of current value creation architectures and supply chains toward a sustainable system of production and consumption. Driven by a vision of continued economic expansion and growth on a planet with finite natural resources, CBMs are endorsed by political institutions, multinational corporations, business consultancies, and academia. Some argue that CBM configurations contribute to a more holistic and radical change in the existing business logics than approaches that achieve incremental resource efficiency improvements. However, how "holistic" and "radical" are CBMs theoretically constituted in academia if we consider the deep structural and paradigmatic shifts in societies necessary to deal with the challenges associated with the Anthropocene? Prior studies do not examine the inherent normative settings and the operational change approaches beneath CBM concepts. To reconstruct the theoretical foundations of CBMs critically, the recent CBM body of academic literature is systematically reviewed according to (1) the legitimacy of CBMs (why should it be done) (2) the modes of value creation and offerings (what should be done), and (3) the core principles of CBM integration into daily business (how should it be done). From this synthesis, the predominant notion of sustainability behind the CBM concept can be revealed. This study argues contemporary scientifically constructed CBMs need to be reconsidered if they are intended to contribute to a profound economic transition toward sustainability. Hence, the paper shows how principles from more "holistic", "radical", and pluralistic economic approaches can widen CBMs and how future research can help to diversify the concept. [ABSTRACT FROM AUTHOR]

Product-Service Systems (PSS) are widely recognised as promising models for increasing circularity and sustainability in business, but the extent to which they contribute to sustainability is still debated. While growing and insightful, the literature on PSS sustainability fails to cover all the relevant aspects and to take stock of the ways PSS can be conceptualised as contributing to strong sustainability. We contend that if PSS are to be designed to be strongly sustainable, clear guidance is needed based on both clear normative premises and sound empirical knowledge. Based on systematic and non-systematic literature reviews on the drivers of PSS (un)sustainability and a long-course field work on the development of PSS in Brussels (Belgium), the paper identifies important sustainability challenges that PSS frequently face and that PSS initiatives should address. These challenges are articulated with insights from the sustainable business models literature and anchored in a strong sustainability pre-analytical stance. An original analytical framework based on 5 dimensions (access, substitution, systemic dematerialisation, territorial anchoring and sufficiency) and 15 criteria of Strongly Sustainable Product-Service System (SSPSS) is proposed. • Product-Service Systems (PSS) still need guidance to be developed in a transformative way towards sustainability. • PSS sustainability is appraised in relation to ecological economics, strong sustainability and sustainable business models. • Identification of what makes PSS strongly sustainable is performed through literature reviews and in-depth field work. • Criteria and relevant questions along five dimensions characterise "Strongly Sustainable Product-Service Systems" (SSPSS). • A definition for SSPSS is proposed. [ABSTRACT FROM AUTHOR]

The process of developing sustainable and circular business models is quite complex and thus hinders their wider implementation in the market. Further understanding and guidelines for firms are needed. Design thinking is a promising problem solving approach capable of facilitating the innovation process. However, design thinking does not necessarily include sustainability considerations, and it has not been sufficiently explored for application in business model innovation. Given the additional challenges posed by the need for time-efficiency and a digital environment, we have therefore developed a design thinking-based framework to guide the early development of circular business models in an online and efficient manner. We propose a new process framework called the Circular Sprint. This encompasses seven phases and contains twelve purposefully adapted activities. The framework development follows an Action Design Research approach, iteratively combining four streams of literature, feedback from sixteen experts and six workshops, and involved a total of 107 participants working in fourteen teams. The present paper describes the framework and its activities, together with evaluations of its usefulness and ease-of-use. The research shows that, while challenging, embedding sustainability, circularity and business model innovation within a design thinking process is indeed possible. We offer a flexible framework and a set of context-adaptable activities that can support innovators and practitioners in the complex process of circular business model innovation. These tools can also be used for training and educational purposes. We invite future researchers to build upon and modify our framework and its activities by adapting it to their required scenarios and purposes. A detailed step-by-step user guide is provided in the supplementary material. [Display omitted] • Design thinking frameworks are adapted for circular business model innovation. • The Circular Sprint contains 12 activities to be applied in 7 innovation phases. • The method combined literature research, expert feedback and 6 workshops. • Sustainability orientation can support divergent and convergent innovation phases. [ABSTRACT FROM AUTHOR]