Income distribution is an economic measurement that looks at the gross domestic product (GDP) of a state and works out how evenly – or otherwise – this is distributed among its inhabitants. GDP is the total monetary value that a country has earned from all of its combined goods and services. However, global income distribution looks at the whole world's economy as a single entity and then assesses the distribution of such earnings across the global population. It does not measure or take into account wealth, however, which has been earned and stored in previous periods. The residual value of land, for example, would not be taken into account but money earned from growing crops on it would be.