I must ask you one more thing, regarding institutions.
You have made me see that marriage is like economics, that it is an artifact of human imagination, and the agreement among certain humans who "play the games" jointly -- thereby it is a social technology. When inventing the rules of the game it is done by moral agents, i.e. human beings.
So how can institutions and contracts that are made by moral agents be purely amoral?
Isn't the creation of contracts based on some idea of morality because moral agents are behind it making the contracts?
I suppose it's a matter of perspective, right?