I do hope this is just because he’s confused, not because he actually wants to do this:
The first assumption in that new relationship is that because labour is a renewable, but at the same time instantly depleted resource ( because if we do not use it in the present it is gone forever), then it must be the variable whose use is maximised in the production process.
Great, eh? Bring back the teaspoons to dig the reservoirs with.
This is after he tells us that:
So, what is the answer? In my opinion we have simply got the definition of productivity wrong.
Yep, all economists before the Great One have been wrong.