there is a lack of understanding of how systematic sufficiency-based business models could be developed and promoted, and how it would change the economic system. Rebound effects A third objection to sufficiency is that, as for efficiency, the energy and material savings could lead to indirect rebound effects. This suggests that sufficiency should be implemented as comprehensively as possible, to avoid savings in one sector being annihilated by the growing environmental footprint of another. Capping incomes and resource use are strategies that could mitigate rebound effects. Research and projects The ENOUGH network (International Network for Sufficiency Research & Policy) has been established in 2018 to bring together scientists and experts from around the world and from various fields working on sufficiency. It aims to increase the visibility of the topic, facilitate networking activities and information sharing, and to act as a resource centre. Other projects on sufficiency: The energy sufficiency project from eceee (European Council for an Energy Efficient Economy) has delivered concept papers on various aspects of sufficiency. The 'Sufficiency in daily life' project at the Basel University (2016-2019) explores different aspects of sufficiency as a strategy for a ‘2000 Watt’ society. Consumer habits, everyday routines, and sufficient lifestyles are investigated. The 'Living Well Within Limits (LiLi)' project at University of Leeds (2017-?) involves qualitative and modelling approaches to answer three research questions: What are the biophysical resources required to achieve human well-being? What influence do social and technical systems have on the levels of resource use associated with well-being? If remaining within planetary boundaries requires rapid decreases in resource use, how could these scarce resources best be employed to preserve well-being? The 'Fair limits' project at University of Utrecht (2017-2022) focuses on ‘Limitarianism''’, i.e. the view that there should be upper limits to how much each person could have of valuable goods. The philosophical argumentation is discussed, as well as what ‘limitarian’ institutions could look like. The German 'EnergieSuffizienz' project (2013-2016) investigated several aspects of energy sufficiency in households, urban planning and mobility, such as discussion of sufficiency definitions, development of sufficiency strategies, and recommendations for sufficiency policy packages. The French 'Sobriétés' local project in the North of France (2010-2013) aimed at institutionalising energy sufficiency strategies at the regional and local level. It contributed to structuring a network of regional actors who reconsidered regional energy policies under a new light. The H2020 ENERGISE project (2017-2019) aimed at reducing