Thinking about a lot of science fiction I have read and watched and only one author, Ian Douglas, has produced a future I think likely. (This is not to say that no other author has done this, There is a great deal of sci-fi i have not yet encountered.) Many of his future stories include an economic system radically different from ours. He often writes about, in the background, AIs, Robots, and Nanotechnology that has fundamentally changed human economics and interaction.
What would the world be like if we had so much food and basic goods that we didn’t need to pay for it. What would we do for a living? So many questions and the exciting thing is that it is unfolding before our eyes right now.