What produces a happy society and a happy life? Thanks to the new science of wellbeing, we can now answer this question using state-of-the-art empirical evidence. This transforms our ability to base our decisions on the outcomes that matter most, namely the wellbeing of us all including future generations. Written by two of the world's leading experts on the economics of wellbeing, this book shows how wellbeing can be measured, what causes it, and how it can be improved. The findings of the book are profoundly relevant to all social sciences, including psychology, economics, politics, behavioural science and sociology. This is the first field-defining text on a new science that aims to span the whole of human life. It will be an invaluable resource for undergraduate and graduate students, as well as policy-makers and employers who will be able to apply its insights in their professional and private lives.