You are right - equal pay for equal work is an easy concept to understand - it is basic fairness. Instead, Africans are played off against local labor groups and it leads to structural imbalances like women still being paid only 82 cents on the $. And folks go around ridiculing equal-pay advocates as "social justice warriors in SF or NY" or "self-anointed do-gooders"!

> We need to get to a place where the labor of human beings has a globally defined fair minimum wage

That is just economic nonsense. Labor productivity of economy depends on utilization of capital and ideas in that economy and it is pretty hard to increase. Average wage per hour in that economy cannot be higher than average productivity per hour. If you set minimal wage higher than its productivity, then you just destroyed almost all legal employment and forced everyone to grey economy or subsistence agriculture.