Men feel threatened by having a female boss and react more aggressively as a result, according to a study.
Even those who apparently support gender equality behave differently with a female manager - and push for higher salaries than if their supervisor were male.
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Italian scientists carried out a series of experiments looking at men in the workplace. The first involved 76 students, 52 male and 24 female, who were told they would negotiate their pay with a man or woman manager.
Their feelings were monitored by asking them to choose between words flashed up on a screen. Male participants were found to be more "under threat" when speaking to a woman, and demanded higher salaries than those speaking to a man.