Negativity costs the US between $250 and $300 billion every year in lost productivity, according to the Gallup Organization. This sort of pseudo-scientific corporate speak makes my BS detector go on high-alert. Your point is better made without relying on PR friendly made up statistics.
Actually I believe they are attempting to create the proper science to accurately gauge/estimate things like happiness and the effects on productivity. $300 Billion isn't actually that much of an increase. Is it that hard to imagine that people being happier would increase productivity?
Actually yes. I truly believe that the more content people are, the less inclined they are to be productive.
Also being negative doesn't mean you are unhappy.