Determinants of trade union membership / Claus Schnabel -- Economic models of union behaviour / Robin Naylor -- Unions, bargaining and strikes / Peter Cramton and Joseph Tracy -- Unions and productivity, financial performance and investment: international evidence / David Metcalf -- Collective bargaining and macroeconomic performance / Robert J. Flanagan -- Changes over time in union relative wage effects in the UK and USA revisited / David Blanchflower and Alex Bryson -- Unions and wage structure / David Card, Thomas Lemieux and W. Craig Riddell -- Unions and innovation: a survey of the theory and empirical evidence / Naercio Menezes-Filho and John Van Reenen -- Trade unions as political actors / Wolfgang Streeck and Anke Hassel -- Unions and unionism around the world / Jelle Visser -- Recent changes in the industrial relations framework in the UK / John T. Addison and W. Stanley Siebert -- Europeanization of collective bargaining / Dieter Sadowski, Oliver Ludewig and Florian Turk -- Contemporary developments in and challenges to collective bargaining in the United States / John Delaney.