(Actually, the research in question had caveats: absolute income correlated with happiness until one's basic physical & health needs were satisfied. After that point, it didn't matter: instead, what mattered was how well you were doing relative to your peer group. So for there to be winners, there had to be losers as well.)
http://www.medicalnewstoday.com/articles/29109.php
(Actually, the research in question had caveats: absolute income correlated with happiness until one's basic physical & health needs were satisfied. After that point, it didn't matter: instead, what mattered was how well you were doing relative to your peer group. So for there to be winners, there had to be losers as well.)