United States. Bureau of Economic Analysis. "Personal Income and Outlays: March 2018 : Historical Comparisons, BEA 18-20,"
Bureau of Economic Analysis (BEA) News Releases
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https://fraser.stlouisfed.org/title/6148/item/602627/content/pdf/bea_newsreleases_20180430_historical-comparisons, accessed on July 13, 2025.