The fact is that men are better negotiators but transparency will help make companies accountable.

Is transparency really the answer? I think so. The retailer Gap last week published its salary figures and revealed equal pay regardless of gender. Which, I imagine, makes for very happy employees. By making the figures public, you’re stopping the suspicion that maybe, probably, the person sitting next to you is paid more because he is a man. A US study found people who experienced pay transparency were 10 per cent more productive than those who had no idea how they stood compared to colleagues.

http://www.theguardian.com/women-in-leadership/2014/sep/01/gender-pay-gap-grazia-equal-pay-campaign