As defined by the World Bank, the Gini coefficient reflects the distribution of income and consumption expenditure among different households. Statistics of most countries in the world is the distribution of income, and income is defined as disposable income after tax, but there are also some national statistics is the distribution of consumer spending, such as India, due to the factor of diminishing marginal propensity to consume, gini coefficient was calculated by the consumer spending will be significantly lower than using the gini coefficient of income, for example, India's gini published in 2005, the world bank The coefficient is 0.33, but it would exceed 0.6 if measured by income. On the other hand, if China's Gini coefficient is calculated using the consumption expenditure method, China's gini coefficient will be only 0.26 in 2000.
The meaning of the text is that the difference of gini coefficient calculation index affects the comparability between countries.