Brazil is a train that moves, but does not let people change wagons: how difficult social mobility is

One of the biggest difficulties in doing this type of generational analysis is to monitor family income over time. The Institute for Mobility and Social Development (IMDS) was able to overcome this challenge by combining records from the Federal Revenue Service, the Annual Report on Social Information (Rais), the Unified Registry and the Bolsa Família with household surveys from the IBGE. The survey follows about 7 million Brazilians born between 1983 and 1990, comparing the average gross income of the residents of the household during childhood and adolescence with the income achieved by these individuals between the ages of 25 and 29.