Sounds like you're suggesting that instead of doing a headcount for population growth, we should be looking at biomass. Interesting. This would mace sense for big mac economics and the newly founded field of coke economics.
Yes. GDP per capita is a meaningless statistic - what we want to know is GDP per kilogram. Likewise, American productivity as measured per worker is a meaningless statistic, but the productivity of the American worker-kilogram will determine our global competitiveness.
It makes sense when you think about it. Measuring things at the level of an individual implies some sort of "consciousness", but we're learning in neuroscience/philosophy class that consciousness is mostly an illusion. I mean, our brains are made of meat. How can meat be conscious?
Never mind how! If meat can be conscious.. lets just say it can for the moment.. than it stands to reason that more meat can be more conscious. They're growing more, bigger meat all the time! Maybe if their meatbodies get big enough... Nevermind, this is stupid.. yep, you're right... meat can't be conscious... I know I know. I got carried away.