ASEC

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The data sources: * **Nominal Median Household Incomes:** Official historical statistics published by the[U.S. Census Bureau](https://www.census.gov/topics/income-poverty/income.html) via the Annual Social and Economic Supplements (ASEC) of the Current Population Survey (CPS). * **Bracket Ratios & Tier Definitions:** The relative distribution tier framework established by the [Pew Research Center](https://www.pewresearch.org/short-reads/2022/04/20/how-the-american-middle-class-has-changed-in-the-past-five-decades/) in its long-running study of the American middle class.