Bosses that grumble or get ready for a rumble aren’t as effective as those who are humble. So says a study from the W.P. Carey School of Business at Arizona State University in conjunction with researchers from the U.S, China and Singapore. To conduct the study, they interviewed more than 60 CEOs from private companies in China and 1,000 of their managers. The overwhelming response was that bosses who act with humility as well as appreciating and empowering their workers make the best bosses. Angelo Kinicki at Arizona State University says that leaders who are controlling and driven by self-interest are typically perceived as the most effective bosses but the study finds otherwise. Kinicki contends that the humble leaders have unique strengths that trickle down to others and they will freely acknowledge their weaknesses in order to become better bosses.