The distribution of income in an economy matters and can be measured on a country by country basis by the Gini Coefficient. However Gini values are not all up-to-date.
World Economics has developed a simple Inequality Index which references the Gini Coefficient in relation to each country for comparison purposes.
The Index is on a scale of 0-100, a high value indicates a more egalitarian society - and a low value suggests a lot of the national income is in the hands of very few depending upon the unit of measurement.
Yemen's data is highlighted in the table below, use the filter and sort order options to allow easy comparison with other countries.
Data source: World Economics, London