If there is one thing that confuses me, that is productivity.
You start doing the thing you were doing twice as fast earlier, thus your productivity doubles. Kind of, assuming that the price of your product does not change due to your increased productivity. If the price halves at the same time (e.g due to competitive pressure because you were not the only one to figure how to spend half the time doing same thing) your productivity measured in dollars did not change at all. Weird. You do twice the stuff at same time than before and now I claim your productivity did not change. Makes no sense whatsoever. So did your productivity increase or not? I have no clue.
Even further confusion. Your increased(?) productivity just caused that with same amount of money people can by more of your stuff, i.e deflation. Now, why the heck, given the massive increase in productivity(?) during the last century, we have seen inflation, not deflation? Makes no sense to me.
It looks to me like we would need to have more words for different kinds of productivity. Because at least I am confused as heck what that word actually means...