Individual worker / team / prod line. Sure you can measure those. That’s great for those at thst level… But I don’t know how you add them up across the whole of “America” without some very dubious economic statistics bullshit.

Empirically , economy wide measures are generally useless i reckon. And often manipulated. It’s very hard to add up output of different production lines (or different goods or services) in a single meaningful measure and account for all the variables like quality, product mix, availability and if you’re using price-weights all stuff that distorts market power. Econo-statisticians will calculate it, because they get paid to, but the honest/aware ones should fess up it’s got serious weaknesses however you calculate it.