“…The latter captures much better than the above simple equation the underlying nonlinear tradeoffs between 'energy consumption and/or environmental strain' and 'life quality' (Goldstein, 1985). Goldstein's empirically developed idea that basic human needs indicators -like life expectancy -are a non-linear function of development levels has been so widely received in the social science literature that is has become a real international standard nowadays (see Afxentiou, 1990aAfxentiou, , 1990bAnand and Ravillion, 1993;Anson, 1988Anson, , 1991Cheng, 1989;Dixon, 1987;Dixon andMoon, 1986, 1989;Fosu, 2009Fosu, , 2010aFosu, , 2010bFosu, , 2010cKakwani, 1993Kakwani, , 1995Khan, 1991;King, 1998;Knight and Rosa, 2011;Mazumdar, 1996Mazumdar, , 2000Moon and Dixon, 1992;Newman and Thomson, 1989;Rudra, 2009;Tausch and Prager, 1993). The neglect of such a basic non-linear function (whatever its concrete mathematical formulation 12 ) is a major shortcoming of the currently used Happy Planet Index calculation.…”