United States. Bureau of Labor Statistics. "Chart - Unit Costs, Unit Profits and Prices in Nonfinancial Corporations," in United States. Bureau of Labor Statistics. "Private Business, Nonfarm Business, and Manufacturing Sectors : Second Quarter 1980," Productivity and Costs (July 28, 1980) : 15-15. https://fraser.stlouisfed.org/title/131/item/55897/toc/437559 , accessed on May 3, 2024.