The Nairobi-headquartered charity said in a report released ahead of the annual World Economic Forum of political and business leaders in Davos, Switzerland, that women around the world work 12.5 billion hours combined each day without pay or recognition.

In its "Time to Care" report, Oxfam said it estimated that unpaid care work by women added at least $10.8 trillion a year in value to the world economy - three times more than the tech industry.

"It is important for us to underscore that the hidden engine of the economy that we see is really the unpaid care work of women. And that needs to change," Amitabh Behar, CEO of Oxfam India, told Reuters in an interview.

To highlight the level of inequality in the global economy, Behar cited the case of a woman called Buchu Devi in India who spends 16 to 17 hours a day doing work like fetching water after trekking 3km, cooking, preparing her children for school and working in a poorly paid job.