UpAndComing
Veteran
It depends on how you define efficient. I'd say it hasn't been invented yet. Computers running algorithms directing production for exactly what we need at any given time is what I want.
Anything that doesn't create landfills of endless junk that we don't really need. In a never ending growth system with only finite resources
So Capitalism it is
We can't keep living in theories breh, we have to live in reality