Fewer than 20 percent of employees are "highly engaged" at work. That's what Gary Hamel, management guru and bestselling business author, told Big Think during a recent interview. He believes that companies' largest source of exploited value is employees who don't unlock their full potential. In order to bring out productiveness and passion in staffers, executives need to follow Hamel's advice. He also gives clever tips on how to cut costs without sacrificing value-- plus, how to know when not to cut costs. Hamel predicts that the future of management will change drastically- an inevitable truth, especially when "the lifespan of a great strategy is shrinking."