[randomdata]

> he seems to have this idea that everybody would chip in only 15 hours a week in order to produce enough stuff for the whole of society. [...] we shall endeavour to spread the bread thin on the butter-to make what work there is still to be done to be as widely shared as possible. Three-hour shifts or a fifteen-hour week may put off the problem for a great while.

And approximately a decade later, the United States did just that. The workweek was reduced to 40 hours to make what work there was to be done as widely as possible. He didn't get the number of hours quite right, but nailed the overall premise.