Brunori, Ferreira and Peragine (2013, p. 15) acknowledge the complexities involved in this area, however, and identify "the issue of age of responsibility, and whether or not all inequalities in access to services for children below a certain age should not be considered inequality of opportunity." For example, parents may choose which school their child attends, in which case this is a 'circumstance' beyond the child's control. Similarly, parents may influence their child's 'effort' in various ways, such as by funding extra tuition, but unless the child is fully involved in these decisions, and depending on the context, this may again be best regarded as a 'circumstance' from the child's perspective. We compare how different formulations of our measure of this aspect might affect a country's relative position (ranking) in terms of inequality.