Like many other countries, poverty in the U.S. is measured by a set of income thresholds that vary by family size and composition. These thresholds are supplied by the Census Bureau and are updated annually to account for inflation, as measured by the Consumer Price Index for All Urban Consumers (CPI-U). Other countries do not use an absolute threshold, but instead a relative level of income below which the poverty line is established. For instance, a country may say that the bottom 10% of all earners constitute those in poverty.