I originally posted this in response to another thread but after swaggering away from my laptop in a vaunting fashion after posting it, I decided it deserved to be posted on its own. (I have detailed it a bit more to be fair.)
Thats down to the different choices that women make, such as taking time out to have a child, the tendancy to take degrees and enter into professions with lower pay (1), working less hours on average, tendency to work part-time, taking more holidays and more time off sick than men, etc.
Women prefer people-oriented professions whilst men prefer technical jobs. But I hear you scream - "that this is due to socialisation" but study after study (2) performed by leading developmental psychologists show that even new born babies exibit these differencies.
They test this by recording how long babies look at a particular object, and males look at mechanical objects such as mobile phones, calculators etc. longer than females look at faces.
Women are also significantly less likely to take a job involving a high degree of risk to life, as indicated by the statistic that males account for 93% of all workplace fatalities.
Differences in personality between genders is also a factor: women tend to be more agreeable than men on average and so are less likely to effectively ask for a pay rise, and more likely to accept a lower one.
It's true that if you take a univaried analysis of median income then there is a difference between the genders, but if you take a multivaried analysis (3) like the ONS has done and several femenist Harvard economists (4), they find that when you take these differences into account that the gap shinks to the point of vanashing. In fact, they actually show that women working part-time earn more than men working part-time and that between the ages of 20-29 women earn more.
Even the Feminist organisation 'American Association of University Women' have concluded (if you look beyond the verbal sleights of hand) that when you take into account all of these different factors, the wage gap shrinks to around 6.5 US Cents.
Probably the most exhaustive of the studies (5) was commitioned by the department of Labour under Obama and when they examened more than 50 peer-review papers they also found that when you take these factors into account, the gap reduces to 4-8 US Cents.
As Christina Hoff Sommers says, "Want to close the wage gap? Change your degree from feninist dance therapy to electrical engineering."
(1)
https://www.thedailybeast.com/no-women-dont-make-less-money-than-men (2)
https://www.researchgate.net/publica...d_Female_Brain (3)
https://visual.ons.gov.uk/the-gender...at-affects-it/ (4)
http://scholar.harvard.edu/files/gol...te_sectors.pdf (5)
http://www.consad.com/content/reports/Gender%20Wage%20Gap%20Final%20Report.pdf