According to the Club de Madrid, shared societies can be described as societies where people share an equal capacity to participate in economic, political and social opportunities regardless of their religion, ethnic or linguistic groups, and where as a consequence relations between groups are peaceful, are inherently desirable.
The Club de Madrid has had a particular interest in the relationship between inter group diversity and economic performance. Some time ago it developed an initiative on intergroup relations called the Shared Societies Project to provide current leaders with greater understanding of the benefits of social cohesion, as well as the incentives and means to advance it.
This book provides the economic arguments for a shared society as well as country studies.