[...] If a poor country's income goes up from $5,000 to $5,500 (a 10 per cent increase), and a rich country's income goes up from $50,000 to $54,500 (a per cent increase), the Gini index will show decreasing inequality because the income of the poor country is growing faster than that of the rich country, even though the gap between them has grown by $4,000. In light of this, many economists reject the Gini index as an overly conservative measure. It is possible to correct for this bias by calculating the absolute Gini index. Sudhir Anand and Paul Segal have done exactly that and estimate the global inequality rose from a Gini index of 57 in 1988 to 72 in 2005--a dramatic increase.