[hxa7241]

What makes using an honesty-box moral? It is not that one side has dictated the terms.

Imagine finding an empty car-park, parking your car, approaching the honesty-box and finding a note declaring the owner does not expect money but instead expects to be paid in teeth: and would the car-park users please pull-out a tooth and deposit it. Would that be moral?

Yes, one could say it is moral to all follow a general rule of reciprocating, of giving something as well as receiving. But what and how much?

The morality of cooperative interaction is not about what one person wants, it is about how all are affected.

Saying what exact actions and amounts would be moral is in general an impossible calculation. But what would clearly not be moral is one party dictating to the other. Once you deliberately offer to engage in cooperative interaction you alone no longer set the rules.