Over a four-year period, male employees assigned a male manager were promoted at a faster rate than their female counterparts, with no observable difference in performance
https://hbswk.hbs.edu/item/the-old-boys-club-schmoozing-and-the-gender-gap
https://hbswk.hbs.edu/item/the-old-boys-club-schmoozing-and-the-gender-gap
The Old Boys' Club: Schmoozing and the Gender Gap
Over a four-year period, male employees assigned a male manager were promoted at a faster rate than their female counterparts, with no observable difference in performance. Male employees benefited from the higher rates of social interactions with their male managers.