Actually, while I still hold to my below reply, I’d like to add that I find The Prisoner’s Dilemma to be the foundational question of morality. The purpose of morality is to persuade/coerce everyone to always cooperate in Prisoner’s Dilemma situations (simplification, but that’s the essence). If you find money in a shared living space, cooperation = trying to return it, defecting = keeping it. Unless there’s extreme justifying circumstances (which you shouldn’t trust anyway, we are all running on corrupted hardware, better to let a disinterested 3rd party decide what counts) you should cooperate.
Actually, while I still hold to my below reply, I’d like to add that I find The Prisoner’s Dilemma to be the foundational question of morality. The purpose of morality is to persuade/coerce everyone to always cooperate in Prisoner’s Dilemma situations (simplification, but that’s the essence). If you find money in a shared living space, cooperation = trying to return it, defecting = keeping it. Unless there’s extreme justifying circumstances (which you shouldn’t trust anyway, we are all running on corrupted hardware, better to let a disinterested 3rd party decide what counts) you should cooperate.
There’s (at least) also the question of what structures and processes count as other players in the dilemma, but you did say it was a simplification.