Hey, You! Mean People Earn More, Study Finds

http://online.wsj.com/article/SB10001424053111904823804576502763895892974.html?mod=WSJ_hps_sections_management

For men being agreeable may not conform "to expectations of 'masculine behavior,'" the researchers write in the study. People who are more agreeable may also be less willing to assert themselves in salary negotiations, Dr. Livingston adds.