One might expect that a pleasant nature would be an advantage in the workplace.

But according to a new study, being nice could be detrimental to your earnings, with dominant women earning up to £40,000 more during their working lifetime.

The research, carried out by Guido Heineck from the Institute for Employment Research in Nuremberg, Germany, found that personality traits in female employees can affect their earning potential.

Over 5,000 men and women between the ages of 20 and 60 were asked to take a psychometric test, highlighting five basic personality traits – openness to experience, conscientiousness, extroversion agreeableness and neuroticism.

The 'alpha females', who adopted a more masculine approach in the office earned 4 per cent more than their more 'passive' colleagues. Those who were deemed to be anxious or moody experienced a drop in salary of 3 per cent.

However, varying personality traits in male workers had almost no effect on the salary.

Mr Heineck told the Daily Mail: "Personality traits can have the same impact on earnings as intelligence. Our statistics show that being nice does not pay for women, whereas working hard does.

"This is probably, in part, because agreeable people are too passive in conflict situations and are poorer wage negotiators.

"Traditionally, women are more passive and likeable at work. This shows that to be successful in the workplace, women have to adapt to more alpha male-like behaviour."

With the pay gap between men and women in fulltime work currently 12.8 per cent, according to the Office for National Statistics, it seems women will need to get in touch with their masculine side in order to dominate in the workplace.

Let us know what you think. Is the dominant approach the key to better earnings?