Cybernetics. The needs of people are essentially known and predictable. We can just make them and give them to people. That is also kinda how most of human history worked and it was fine then. It could be fine now, even better with computer data analysis and rational processing.
Sure there will be exceptions like little Japanese computer parts. However some democratic process could be used. Plenty of writers and scifi stories have possible systems. We can figure that out when we get there.