Imagine this situation. For some reason, Jack knows that by committing suicide in a very painful way, he can make Jill a little bit happier. Jack wants to do this. In a few minutes we will have our memories erased of this situation & Jack will continue to live a happy life. Now I have control over whether I allow Jack to go through with the suicide. What is the moral thing for me to do?
On the one hand, if I let him commit suicide, there will be less net happiness (Jack suffers much while Jill gains little) but more preferences satisfied (one). On the other hand, if I prevent him from doing so, there will be more net happiness (Jack much more happy, Jill a bit worse off) but less preferences satisfied (one less).
I suppose this is a complicated way of asking which is more important (or which is important full stop)- preference satisfaction or happiness? I'm not entirely sure why, but I wanted to illustrate the question in this way, even if it is a little confusing! Worth a shot. Thanks, Holly M.