Two socioeconomic variables are used: the level of education of the household head and the socioeconomic level of the household (on the basis of household equipment). In the case of education, the age of the household head is controlled for to ensure that the segregation pattern observed was not due exclusively to an exogenous age effect.24 Ten countries with available microdata from the 2000 and 2010 census rounds are considered.25 In these countries, a selection was made of cities with over 1 million inhabitants (the exception being Cuenca in Ecuador, which has no more than 500,000 inhabitants) that had different urban situations and could thus be taken as representative of the different metropolitan dynamics in each country. In all the cities,25 higher levels of segregation are found in the group with a high level of education (tertiary education or above).