This week's "Lexington" in "The Economist" was inspired by a new book entitled "Gross National Happiness".Mr Brooks [the author] proposes that whatever their respective merits, the conservative world view is more conducive to happiness than the liberal one (in the American sense of both words). American conservatives tend to believe that if you work hard and play by the rules, you can succeed. This makes them more optimistic than liberals, more likely to feel in control of their lives and...