https://upload.wikimedia.org/wikipedia/commons/thumb/1/1e/19...
Your citation
* Doesn't show how labor compensation is distributed among workers (CEO pay vs. median wages).
* Doesn't account for how capital returns are distributed among different wealth levels.
Like I said: there is a threshold of Stuff Created Per Person above which providing a comfortable life for every person is purely a distribution problem. For most of human history, we have not been above that threshold.
"Subsistence farming", for instance, is effectively defined by only being able to meet the much lower threshold of "enough that people can survive".
A post-scarcity society is, broadly speaking, defined by being able to produce enough for everyone to thrive with minimal work from anyone.
We are somewhere between the two, but we are reaching the point where we're closer to the latter than the former. Technological advancements have, for some time, ensured that we have enough food for everyone on earth (again, there's still a distribution problem; that part is nearly 100% about politics, not about scarcity). If the very wealthy had not captured all the productivity increases since 1980, I don't know what else we could have achieved, but it wouldn't have been small.
> Economic statistics shows it hasn't been captured.
Look at any graph of income growth by quintile that goes back to the middle of the 20th century or earlier, and you'll see it starts with some roughly parallel lines, and then one line that keeps going up at about the same slope, while the rest stay nearly flat.
https://www.sas.upenn.edu/~jesusfv/Slides_London.pdf
https://www.mckinsey.com/mgi/our-research/dependency-and-dep...
>[...] I don't know exactly when real-world productivity got enough higher than P that we could realistically start reducing worked hours, but it definitely did so at some point in the last several decades. [...]
GDP per capita has been growing exponentially for centuries[1]. Is there some arbitrary GDP per capita level where people should be expected to kick back and relax? Why makes your arbitrary line more or less correct than someone else's arbitrary line? Moreover people's revealed preferences show that for most people, that line hasn't been reached yet. Why should people's revealed preferences be overridden by whatever number you came up with?
[1] https://ourworldindata.org/grapher/gdp-per-capita-maddison-p...
>If, instead, the surplus is captured by the wealthy, the workers don't see benefit, and inequality grows.
Economic statistics shows it hasn't been captured. Even if you're some sort of marxist that thinks labor's share of GDP should be 100%, at the very most this means the point at which everyone can kick back and relax is delayed by 40%.
https://fred.stlouisfed.org/series/LABSHPUSA156NRUG