take a deep breath and count to 10
I made no case that 'greenbacks' have intrinsic value... in fact that is the point. gold and greenbacks basically have the same intrinsic value in the 21st century economy
Lets not start injecting strawmen and reading between the lines too much, the topic is complicated enough with creating additional issues
With regard to GDP, I can agree that it isnt the perfect model. But what I am trying to present is that the creditworthiness of a nation and value of the currency is more tightly linked to useful production than it is to how much of some metal we have stored in vaults. So while CDP is a measure of consumption, it is also can be viewed as a simplistic measure of useful production by the economy.