The magic income: $75,000 a year. As people earn more money, their day-to-day happiness rises. Until you hit $75,000. After that, it is just more stuff, with no gain in happiness.
Δηλαδή περίπου 59.000 ευρώ. Δηλαδή 4.200 το μήνα καθαρά (με 14 μισθούς). !
http://blogs.wsj.com/wealth/2010/09/07/the-perfect-salary-for-happiness-75000-a-year/