Adding income from production to property income (section 2) gives primary income. Total income is the sum of primary income and current transfers received (section 4); from this measure it is possible to obtain disposable income, which is total income less current transfers paid (section 8). Total and disposable incomes are the most commonly used income aggregates. However, to provide additional insights into the nature of poverty in a country or area, compilers of poverty statistics may also wish to make use of supplementary income measures, such as income before social transfers.