How would that be controlled-for when there are shifts in unskilled and semi-skilled work around the globe, automation, local demographics changes, aging population, increasing densities of people (tending towards depression which also reduces aggression (T)), and massive income inequality increasing the economic stresses on the average person (that alone would kill T in all genders)?
> Can it be affecting the contributions of 50% of the population?
How would this be measured without a duplicate control Earth? Hypothetically: if everyone in sadder areas had as much food and money as they needed to be comfortable, I guarantee T levels would be much higher in men and women, there would be a lot more sex, a lot more happier people, and a lot more babies in 9 months.
> And what would we actually do if we did realize this?
The average person would probably do what they always do: shrug and do nothing. The plutocrats would only care if their top employees weren't performing optimally and would throw more money and/or better conditions at them.