International Women's Day today draws attention to a number of issues, especially the persistent statistical gap in the average earnings of men and women.
It has persisted, despite the passage of the Equal Pay Act, ever since women began entering the paid workforce in large numbers in the 1970s.
Equal pay for men and women doing the same job proved not to be enough to close the gap, the fact that women predominate in certain kinds of job, such as nursing, caring and cleaning, became the accepted explanation for the gap and the focus of the search for solutions.
But that view now appears to be challenged by research for the Ministry for Women which published its conclusions yesterday. It finds, according to the chief executive, Margaret Retter, "traditional drivers such as type of work, family responsibilities, education and age no longer explain the majority of the gender pay gap.
"In fact, around 80 per cent of the gap is due to 'unexplained' factors, which the ministry views primarily as behaviour, attitudes and assumptions about women in work, including unconscious bias."