Michael Lewis reviews a new book by Darrell West. “In a stroke, the texture of life in this tennis camp had changed, from a chapter out of Lord of the Flies to the feeling between the lines of Walden. Even the most fantastically selfish kids did what they could to contribute to the general welfare of the place, and there was not a shred of doubt that everyone felt happier for it. The distinction between haves and have-nots, winners and losers, wasn’t entirely gone, of course. But it became less important than this other distinction, between the givers and the takers.”