Source: US. Bureau of Economic Analysis
Release: Gross Domestic Product by Industry
According to the source, value added represents the sum of the costs-incurred and the incomes-earned in production, and consists of compensation of employees, taxes on production and imports, less subsidies, and gross operating surplus.
US. Bureau of Economic Analysis, Contributions to Percent Change in Real GDP by Private Industries: Professional and Business Services: Professional, Scientific, and Technical Services [CPGDPPST], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/CPGDPPST, December 9, 2016.