A positive relationship between the socio-economic profile of schools and the quantity or quality of resources means that advantaged schools benefit from more or better resources. A negative relationship implies that more or better resources are devoted to disadvantaged schools. No relationship between the two implies that schools attended by disadvantaged students are as likely to have access to better or more resources as schools attended by advantaged students (Figure 3.5). According to school principals' reports, in 31 countries/economies, students in advantaged schools have access to better educational material resources than their peers in disadvantaged schools, while in 36 countries/economies, students in advantaged schools have greater access to education staff than do disadvantaged students.