books.google.de - There is a paradox at the heart of our lives. We all want more money, but as societies become richer, they do not become happier. This is not speculation: It's the story told by countless pieces of scientific research. We now have sophisticated ways of measuring how happy people are, and all the evidence...http://books.google.de/books/about/Happiness.html?hl=de&id=CQQN8mQt0AgC&utm_source=gb-gplus-shareHappiness
