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The Spirit Level

The Spirit Level: Why More Equal Societies Almost Always Do Better (2009), by Richard Wilkinson and Kate Pickett, argues that high levels of income inequality within societies lead to a wide range of social problems. Using data from developed countries, the authors show that more unequal societies tend to have higher rates of crime, obesity, mental illness, teenage pregnancies, and lower levels of trust, education outcomes, and social mobility.

The key finding is that it’s not just the poorest who suffer—inequality negatively affects the whole population. More equal societies, like those in Scandinavia or Japan, tend to perform better across nearly all indicators of health and well-being.

Wilkinson and Pickett argue that reducing income inequality is essential for improving social cohesion, public health, and quality of life. Their work has influenced debates on economic policy and social justice, though it has also faced criticism over data interpretation and causality.