Blanchflower, David G. - Institute for the Study of Labor (IZA) - 2008
; is U-shaped in age and un-trended over time in the USA although they are trended up in a number of EU countries and …-index, for “unpleasant” or “undesirable”, which measures the proportion of time an individual spends in an unpleasant state. In … large body of data on happiness that is unavailable on the U-index. For example, according to happiness research well …