Context from Eliezer Yudkowsky on twitter:

You meet someone who would like to date you, and who is some X% "better" as a partner for you than your current partner. Let's say you know this for a fact, perhaps according to some perfect compatibility algorithm or a very liquid prediction market.

Do you "trade up"?

For monogamous people, this means breaking up with your current partner. For poly people, let's say it means shifting a majority of the time/resources you currently spend on the partner you spend the most time/resources on away from that partner and to this new person.

If you aren't dating anyone right now, pretend you are.

Please choose the lowest X% at which you would trade up.