a) the chances are the other player will have roughly similiar commitments to you.
b) 50⁄50 is a shelling point that works well for an acausal Trade.
So when choosing my precommitments I know that anything too high is likely to be rejected, anything to low is a waste, and 50⁄50 is likely to be about what most people will choose—as evidenced from the fact that I’m happy to choose it.
I would say:
a) the chances are the other player will have roughly similiar commitments to you. b) 50⁄50 is a shelling point that works well for an acausal Trade. So when choosing my precommitments I know that anything too high is likely to be rejected, anything to low is a waste, and 50⁄50 is likely to be about what most people will choose—as evidenced from the fact that I’m happy to choose it.