What makes a happy society?

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Why has more money not made people happier? People in Japan and the Western world are no more happy now than they were in the 1950s, despite a massive increase in income. In fact, extra money has little impact on people's happiness once a country has more than $15,000 (£8,000) per head. The World Happiness Survey puts Nigeria at the top of the league table of happiness and Romania at the bottom - along with several other former Communist countries. What are the key factors for a happy society? What role do politics, crime, economy and religion play? What makes Nigeria so happy, while the developed world lags behind?