Each person acts on the assumption that more money will bring more hap — Richard Easterlin

"Each person acts on the assumption that more money will bring more happiness; and, indeed, if he does get more money, and others do not (or get less), his happiness increases. But when everyone acts on this assumption and incomes generally increase, no one, on the average, feels better off. Yet each person goes on, generation after generation, unaware of the self-defeating process in which he is caught up."