Surveys have shown that women round the world are paid less for equal work. The issue was recently in the news: American actress Robin Wright, star of the US series House of Cards, recently revealed how she had to fight, and even threaten to leave, to get the same pay rate as her co-star Kevin Spacey.

But one marketing company in London says it has found a way to tackle the gender pay problem. They call it the "Pay Gap Tax".

Video Journalist: Mai Noman

Animations: Ian Lacey

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