The other camp favours the index of segregation, which measures how the members of an ethnic group are distributed.

ECONOMIST: Segregation

The commonly used index of segregation, which measures the number of people who would have to move in order to spread themselves evenly over a city, shows that every large ethnic minority group became less segregated between 1991 and 2001.

ECONOMIST: Race

The authors compute an index of occupational segregation, which compares the composition of employment in individual places with the national profile.

ECONOMIST: Free exchange