The difference in income between the richest and poorest citizens is called the .

The answer is the wealth gap, economic or wealth inequality. It is usually measured using different metrics from consumption, income, and wealth in assets. Indices are used to indicate the measure of this gap such as the Gini coefficient.  Many countries have varying national wealth gaps. Global wealth gap indicates that by 2030 the richest 1% of the global population will possess two-thirds of global wealth.