How much happier would you be about your job if you only had to work four days a week instead of five? Companies around the world that have been trying out four-day work weeks found that it leads to higher productivity, more motivated staff and less burnout. A recent survey of workers in eight countries, including the U.S., found that nearly half thought they could easily finish their work in five hours a day if they didn't have interruptions, but at the same time, many are working more than 40 hours a week, with 49 in the U.S. saying that's the case, the most in the world. Britain’s Trades Union Congress is pushing for the U.K. to move to a four-day work week by the end of the century, arguing that it's a way for workers to share in the wealth created by new technologies like machine learning and robotics, just like workers were given the weekend off during the Industrial Revolution. Ad agency Grey New York began a program in April to let employees work a four-day week, but there is a catch -- they only get 85 percent of their full-time salary.