disparity
noun [ C or U ]
ECONOMICS uk/dɪˈspærəti/ usplural disparitiesa situation in which two or more things are not equal or similar, especially when this is thought to be unfair:
economic/income/pay disparity Manhattan had the greatest income disparity between rich and poor residents outside Puerto Rico.
growing/huge/increasing disparity
One of her priorities will be to eliminate pay disparity between men and women for equal work.
The state has been criticized nationally for large disparities in spending among school districts.