If you are asking humanity, give the money to charity.
If I was one of the two people involved, I’d suggest using the 20 dollars to buy us both dinner (or other jointly enjoyed purchase...charity still works). The social trick leaves neither indebted to the other—in fact it can strengthen the bond.
You can’t come up with a general solution to division problems, because human morality doesn’t work that way. We’ve got really idiosyncratic notions of fairness, especially in cultures which have property rights.
If you are asking humanity, give the money to charity.
If I was one of the two people involved, I’d suggest using the 20 dollars to buy us both dinner (or other jointly enjoyed purchase...charity still works). The social trick leaves neither indebted to the other—in fact it can strengthen the bond.
You can’t come up with a general solution to division problems, because human morality doesn’t work that way. We’ve got really idiosyncratic notions of fairness, especially in cultures which have property rights.