This Handbook is an authoritative and invaluable reference tool, uniquely analysing the forces governing unionism, union behaviour and union impact from a variety of perspectives, both theoretical and empirical. The 14 chapters are written in an accessible style by acknowledged leading specialists from the fields of economics and industrial relations. They offer a truly international perspective on this important subject.This superbly comprehensive Handbook examines the determinants of union membership, models of union behaviour and the economics of strikes, as well as the effects of unions on wages, pay inequality and firm performance (to include innovation). It also analyses trade unions as political actors and their impact on macroeconomic performance. Institutional detail is added in specific chapters documenting recent developments in the US and the UK, and prospects for a Europeanization of collective bargaining. A review of union density in more than 100 nations, is also provided.The Handbook is suited to a range of courses and is aptly designed to meet the needs of students - from undergraduates upwards - and academics in the fields of economics, industrial relations, human resources management, as well as general labour scholars.