It is a well-established fact that in rich societies the poor have shorter lives and suffer more from almost every social problem. The Spirit Level, based on thirty years of research, takes this truth a step further. One common factor links the healthiest and happiest societies: the degree of equality among their members. Further, more unequal societies are bad for everyone within them-the rich and middle class as well as the poor.
The remarkable data assembled in The Spirit Level exposes st .
