United States. Bureau of Economic Analysis. "Personal Income and Outlays, December 2020 : Historical Comparisons, BEA 21-03,"
Bureau of Economic Analysis (BEA) News Releases
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https://fraser.stlouisfed.org/title/6148/item/600353/content/pdf/bea_newsreleases_20210129_historical, accessed on June 20, 2025.