At time-code 20:45 of episode 21 of That Time I Got Reincarnated as a Slime, the merchant Mjolmire is considering Rimuru's offer to go to his capital city and help teach the folks there about trade. He says something I find strange:
"So we would both profit... I mean benefit!"
Why would he feel the need to reject the word "profit"? It seems perfectly natural to me. Rimuru's nation might be an ideal communist society (debatable point) but even communists would understand that a traveling merchant seeks profit. Or is the issue something else entirely?