The volume also includes a cross-country study of skills mismatch in relation to the effectiveness of training programmes.The contributors to this volume examine the evidence on sectoral wage differentials, labour mobility and the ratio of unemployment to job vacancies, in detailed studies of seven countries with a wide variety of labour market and macro-economic structures. They analyse the variations in unemployment rates across regions, occupations and demographic groups and investigate whether these help to explain the growth and persistence of unemployment.The contributors to this volume examine the evidence on sectoral wage differentials, labour mobility and the ratio of unemployment to job vacancies, in detailed studies of seven countries with a wide variety of labour market and macro-economic structures. They analyse the variations in unemployment rates across regions, occupations and demographic groups and investigate whether these help to explain the growth and persistence of unemployment.High and persistent unemployment has been experienced by most developed countries during the 1980s. Many researchers have sought to explain this development in terms of mismatch, arguing that the economies that have suffered most from persistently high unemployment are those that have been least flexible in matching their unemployed with the available employment opportunities. This conference proceedings volume examines the evidence on sectoral wage differentials, labor mobility and the ratio of unemployment to job vacancies in detailed studies of seven countries with a wide variety of labor market and macroeconomic structures: the United States, Japan, West Germany, Sweden, the United Kingdom, Italy and Spain.1. A cross-country comparison of sectoral mismatch in the 1980s Fiorella Padoa Schioppa; 2. Mismatch: a framework for thought R. Jackman, R. Layard and S. Savouri; Discussion Sherwin Rosen; 3. Match and mismatch on the German labour market Wolfgang Franz; Discussilw