I suspect males tend to have a wider bell curve in income so when you combine the data from both sexes males will dominate the winning end (e.g. CEOs) as well a

I suspect males tend to have a wider bell curve in income so when you combine the data from both sexes males will dominate the winning end (e.g. CEOs) as well as the bottom end (e.g. prisons). Nobody pays any attention to the bottom of the pyramid so all they see is a distorted view of a few alpha males dominating in the top half of the pyramid.