As is almost universal in such "studies" (sic) income gets confused with pay rates. If you work longer hours you get paid more and are more likely to be promoted.

Pay should be based on merit alone, not on sex or some other wishy washy category. Therefore, in some cases men should be paid more, in others women should, & in the rest there should be equal pay. It is therefore sexist to demand equal pay based on sex. Pay must be based on merit alone.

For example, in physically intensive jobs men should be paid more because they r obviously stronger & so provide higher output. Whilst in electronics industries women r preferred on the assembly lines because of their superior dexterity assembling tiny electronics parts. Sure, some men may be able to match it with the women but its not worth the effort to test which men can compete, thus men should be paid less.

For most industries the sex should not matter since there is no discernible difference in output qty or quality, eg, software programming.

Grey areas are where there is a mix of responsibilities, such as defense forces, police, etc. Women should not be on the front lines for several reasons, primarily there lack of strength, combat skills, & killer instinct; while in the police men provide superior strength to combat assailants/mobs.

I would prefer male police officers to come to my aid if i am attacked by thugs. Women officers hardly present an intimidating presence & r likely to require backup (from male officers) prior to engaging in conflict by which time the victim/s may be dead or injured.

in the office though men & women should be paid the same.