The Greek word for interest is tokos (τόκος), which literally means "offspring" or "childbirth". Philosophers like Aristotle used this metaphor to argue that usury was unnatural because money is...
Thought provoking, I like it. Wasn't Aristotle's father a banker? I think I heard that somewhere... A banker caught debasing coins, so he got chased out of his original city. Or maybe that was some other philosopher...