Absolute and Relative measures are different ways to communicate Inequality of Opportunities (IOp). For example, if the GINI of Spain is 0.3 and the absolute Inequality of Opportunities (as calculated by the algorithms) is 0.15, then the relative Inequality of Opportunities is 0.15/0.3 or 50%. In other words, we can say that half of total inequality in Spain is explained by Inequality of Opportunities.