Related to this... Maybe as we become more and more advanced in tech, we will spend less and less. Let's see some examples : uber, usually cheaper than normal taxis,great economy of scale. So transportantion in general should decrease in absolute value. Same thing with airbnb, we improve the usage of rooms in the City,and make it cheaper. So, it should make it decrease too. And other start-ups in tech space make this. We optimize things to a lower cost. And this is good. But in macroeconomics, it can reduce the gdp of a country.

Just a tought I have sometimes. Sometime in the future we will need to think another way to measure economic improvement.