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Nakamura, Leonard I. (FRB); Samuels, Jon (BEA); Soloveichik, Rachel H. (BEA) (October 24, 2017). "Measuring the "Free" Digital Economy Within the GDP and Productivity Accounts"(PDF). SSRN.com. Social Science Research Network publishing working paper 17-37 of the Research Department, Federal Reserve Bank of Philadelphia. p. 37 (Fig. 3). Archived(PDF) from the original on March 20, 2021.