Table 3 Summary of measurements of effective progressivity of alcohol spending in South Africa
Definition | |
|---|---|
Lorenz curve | The Lorenz curve assesses the degree of inequality in socio-economic status (SES) in South Africa. |
Concentration curve | The concentration curve is the degree of inequality in alcohol expenditure between poor and wealthier households in South Africa. |
The concentration index | The concentration index (C) is derived from the concentration curve. Its values can vary from − 1.0 (where all expenditure on alcoholic beverages is made by the poorest household) to + 1.0 (where all alcohol expenditure is made by the richest household). |
The Gini index | The Gini index (G) is derived from the Lorenz curve. It corresponds to consumption expenditure inequality. It can vary from 0 (perfect equality in the distribution of consumption expenditure) to 1 (perfect inequality in the distribution of consumption expenditure). |