Jeroen, I would argue that the American office workers I know, working 50-70 hours a week, are on salary. Therefore, they make no money more money by working more. They simply do so in order to get all of the work done that is being placed upon them. The reason for such a load of work is often because the company they work for has trimmed staffing in order to increase profit and bank on the fact that workers will put in more than 40 hours a week to get the work done.