As a result of the Occupy Wall Street Movement bringing concerns about income inequality to the news cycle, my goal was to find data related to this topic. I didn’t have an agenda, really – I just wanted to be able to confirm or deny whether their claims are legitimate.
Of course, the data were easy to get. It’s found here at the Census Bureau’s website. It shows mean income for each Fifth of households on an annual basis from 1967 to 2010. All values are shown in 2010 dollars, which adjusts for changes in purchasing power over time.