There's a utility wich is economic jargon for well being. So making a five year old in america or israel, where i live now, a little happier, compared to transforming the life of a five-year-old in a poor country are moral imperatives. And treating morality like at some sort of market where we can trade things - you never stop arbitraging if you're really maximizing the good. This idea that everybody will end up fairly miserable, but there'll be so many of them it'll be worth yes,. precisely. That a litte might be hard for people to follow.