This is an open access title available under the terms of a CC BY-NC-ND 4.0 International licence. It is free to read at Oxford Academic and offered as a free PDF download from OUP and selected open access locations.Lack of progress in the area of global sustainable development and difficulties in crisis management highlight the need to transform the economy and find new ways of making society more resilient. The social economy is increasingly recognized as a driver of such transformations; it comprises traditional forms of cooperative or solidarity-based organizations alongside new phenomena such as impact investing or social tech ventures that aim to contribute to the public good. Social Economy Science provides the first comprehensive analysis of why and how social economy organizations create superior value for society. The book draws on organizational theory and transition studies to provide a systematic perspective on complex multi-stakeholder forms of action. It discusses the social economy's role in promoting innovation for impact, as well as its role as an agent of societal change and as a partner to businesses, governments, and citizens.