United States. Bureau of Economic Analysis. "Gross Domestic Product, Fourth Quarter and Year 2021 (Second Estimate) : Effects of Selected Federal Pandemic Response Programs on Federal Government Receipts, Expenditures, and Saving, 2021Q4 Second, BEA 22-05," Bureau of Economic Analysis (BEA) News Releases (February 24, 2022). https://fraser.stlouisfed.org/title/6148/item/611516/content/pdf/bea_newsreleases_20220224_effects-gov-4thQ2nd, accessed on March 22, 2025.