24/7 Wall St. estimates American businesses will lose $13.3 billion in lost productivity as workers fill out brackets for the March Madness college championship basketball tournament and stay glued to TV or computer screens to watch. However, a survey released this month by Robert Half International Inc. (NYSE: RHI) found 72% of senior managers report college basketball tournament activities have a positive impact on staff morale and more than half of survey respondents also see productivity benefits.