This open access book offers unique insight into how and where ideas and instruments of quantification have been adopted, and how they have come to matter. Rather than asking what quantification is, New Politics of Numbers explores what quantification does, its manifold consequences in multiple domains. It scrutinizes the power of numbers in terms of the changing relations between numbers and democracy, the politics of evidence, and dreams and schemes of bettering society. The book engages Foucault inspired studies of quantification and the economics of convention in a critical dialogue. In so doing, it provides a rich account of the plurality of possible ways in which numbers have come to govern, highlighting not only their disciplinary effects, but also the collective mobilization capacities quantification can offer. This book will be invaluable reading for academics and graduate students in a wide variety of disciplines, as well as policymakers interested in the opportunities and pitfalls of governance by numbers. Andrea Mennicken is Associate Professor of Accounting at the London School of Economics and Political Science, UK, and Co-Director of the Centre for Analysis of Risk and Regulation (LSE), UK. Robert Salais is Associate Researcher at the Ecole Normale Supérieure de Paris-Saclay, France, and member of the Institutions and Historical Dynamics of the Economy and Society (IDHES) Centre, France.