We ought to eschew interest, profit, and rent in favor of cooperative relationships.
I posit that these things
are cooperative relationships.
Adam wants $500 per month more than he wants to use his basement. Bob wants to live in his basement more than he wants $500 per month. They cooperatively exchange these things to their mutual benefit.
Adam wants $6 in interest more than he wants to use his $100 this year. Bob wants that $100 now more than he wants $106 a year from now. They cooperatively exchange $100 now for $106 a year from now and they are both happier for it.