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Thomas Piketty, author of Capital in the Twenty-First Century Until 2010, I did not know much about the consequences of economic inequality. Then I came across the book The Spirit Level in which the authors Richard Wilkinson and Kate Pickett presented their research results which showed that high levels of inequality in societies is harmful for everyone within them. Their research showed that (1) the more developed a country is, the less important further economic growth is for certain objectively measurable outcomes, like life expectancy ( see graph ), (2) in a study of 23 of the richest countries there was a strong relationship between health and social problems and the level of income inequality ( see graph ), (3) in a study of the 50 American States this same relationship was found ( see graph ).