Diminishing returns at work : the consequences of long working hours

"The book concerns working hours - in the past and in the present, in America and in Britain. The focus is on the relation between hours of work and outcomes such as production and health. Proportional increases in hours of work are shown to result in smaller proportional increases in production and the benefits in output of long working hours may not offset the consequences of long hours for the health and quality of life of workers. Shorter hours of work might benefit both firms and workers."