Paris, the focus of this book, is a highly diverse city with a current population of about 2.24 million inhabitants, making it the largest municipality in France. It is located on the river Seine, in the north central part of the country. Its urban density is very high – double that of central London. Paris is both the French capital city and an international business centre, concentrating the nation’s main political and economic functions and attracting foreign investors as well as tourists from all around the world (around 30 million visitors yearly). As in many other European metropolises, manufacturing, heavy industry and local crafts and trades have progressively left the inner city and a tertiary-sector – oriented economy has developed. e high quality of infrastructure is part of the city’s attractiveness and fosters the social upgrading under way on a citywide scale. e population of Paris is characterised by an over- representation of young adults and single-person households. Income levels and the proportion of immigrants in the city are above the national average, contributing to the diversity of its population.