<p>Why is marriage worth £200,000 a year?<br><br>Why will having children make you unhappy?<br><br>Why does happiness from winning the lottery take two years to arrive?<br><br>Why does time heal the pain of divorce or the death of a loved one ? but not unemployment?<br><br>Everybody wants to be happy. But how much happiness ? precisely ? will each life choice bring? Should I get married? Am I really going to feel happy about the career that I pic...