reciprocality

I think the principle of reciprocality can make it work in principle though.

There is always a reverse reciprocality to responsibility. If you borrow money from me, you will feel obligated to pay me back.

Some have gone so far as to speculate that this suggests reciprocality was an important culture expectation around gift-giving in PIE society.

They also added a reciprocality clause, granting the same term lengths in the EU to any country that also extended terms in their own jurisdiction. This is a ratchet: there's no mechanism for an American or European to object to longer terms, aside from unilateral withdrawl that will disadvantage the first-moving party.

The EU passed a term extension that had a reciprocality requirement: if America didn't agree to the term extension, then American works would enter the public domain in the EU quicker than EU-origin works did. This is a fiendishly clever way to ratchet in term extensions, and it works because the WTO treaties only specify maximums for copyright exceptions, not protection.

Tinder's reciprocality system, where you both have to show interest before a chat is even possible, solves this elegantly. The downside IMO is that it's incredibly hard to find someone that you have more than a physical interest in. OkC's matchmaking questions and match% system is actually a really good solution to this. I think there's a business opportunity in combining the two - enforce the reciprocality like Tinder does, but have matchmaking questions, so it can try to pair you with more likely matches first.

Reciprocality. org/Reciprocality/r0/ which talks about "mapping" and "packing" as two different ways people learn.