There's a big disparity, in some sense, between lower and upper classes in today's world, but the disparity doesn't show up in happiness or longevity so far as

There's a big disparity, in some sense, between lower and upper classes in today's world, but the disparity doesn't show up in happiness or longevity so far as I know. Actually it does: poor people are not as happy as well-off people, on average. Also, for the past 30 or so years, US life expectancy for higher income workers has gone up substantially more then for lower income workers. See [1] for example, or search on "life expectancy by income level" [1] http://www.minnpost.com/second-opinion/2013/03/income-gap-plays-out-us-life-expectancy http://www.minnpost.com/second-opinion/2013/03/income-gap-pl...