This chapter presents a formal “stylised model” in an attempt to pull together the ideas introduced in the introductory chapter into a coherent whole. This is intended to facilitate reasoned discussions on how the environmental, social, and economic influences on individual and community wellbeing interact with each other, as well as the complementarities and tradeoffs between them. In future chapters, this will in turn help us formulate policies towards increasing wellbeing on a sustained basis, while taking into account these complementarities and tradeoffs. Each section of the chapter has three sub-sections. First, a verbal and diagrammatic presentation of the core ideas. Second, a mathematical representation of the verbal and diagrammatic discussion, including the motivations of each of the key actors (such as individual consumers, producers, and the government). Third, a list of references (accompanied by a brief discussion) of the empirical literature that attempts to bring evidence to support or challenge the key assumptions of the theoretical model.