Numerous individuals throughout international labour markets work hours in excess of their standard contractual hours. Overtime working is a vital consideration in the employment and wage decisions of many households and firms. From a policy perspective, overtime is at the centre of interest in the work sharing/unemployment trade off. Robert Hart presents the first comprehensive economic evaluation of this phenomenon, examining theoretical, empirical and policy aspects of overtime hours and pay. In a comparative assessment of labour supply, labour demand and compensating differential models of overtime behaviour, he utilises detailed international evidence drawn from the United States, Western Europe and Japan. Policy initiatives linked to job creation, work sharing, absenteeism and payroll taxation are critically assessed and presented in an intuitive manner. Displaying analytical rigour and empirical expertise, Robert Hart's work extends far beyond a mere summary of existing research to enliven and inform debate.