On March 15, 2018, Reuters reports that HSBC had a gender pay gap of 59 percent at its main UK banking operation. Similarly, on March 18th, 2018, BBC reports that Goldman Sachs also reported a median UK gender pay gap at its international business of 36.4% for hourly pay and a median bonus gap of 67.7%. Its mean average pay gap for hourly pay was 55.5%, and 72.2% for bonuses. What factors account for this striking difference in the rate of pay of the two groups? Be thorough.