The earnings mass is estimated from this ratio and SNA wage data and compared to GDP. While the operating surplus could be treated as a proxy for private sector corporate saving, the increase in its share of GDP does not fully correlate with the rise in this type of saving, since in many countries (the Bolivarian Republic of Venezuela, Chile, Colombia and the Plurinational State of Bolivia) the public sector has a very important role as a producer of raw materials (see ECLAC, 2013a). One is relative inequality, which refers to proportional differences in incomes, while the other concerns income gaps in absolute terms and is usually called absolute inequality.