After that the rate of growth limited by productivity isn't a zero-sum game, but very close to being so?

Only relative to the Jumbo-burger profits they are used to.

The world could hum along happily at 4% ROI, and say inflation at 2%, but once you've seen Pareee... (Once you've tried the hard stuff).

'The history of public debt is full of irony. It rarely follows our ideas of order and justice.' Thomas Piketty