Measurement is debated, as inequality measures vary significantly, for example, across datasets or whether the measurement is taken based on cash compensation (market income) or after taxes and transfer payments. The Gini coefficient is a widely accepted statistic that applies comparisons across jurisdictions, with a zero indicating perfect equality and 1 indicating maximum inequality. Further, various public and private data sets measure those incomes, e.g., from the Congressional Budget Office (CBO), the Internal Revenue Service, and Census. According to the Census Bureau, income inequality reached record levels in 2018, with a Gini of .49.