National Time Accounting: The Currency of Life

Alan B. Krueger, Daniel Kahneman, David Schkade, Norbert Schwarz, and Arthur A. Stone, Measuring the Subjective Well-Being of Nations: National Accounts of Time Use and Well-Being (University of Chicago Press, 2009), chap. 1, https://www.nber.org/books-and-chapters/measuring-subjective-well-being-nations-national-accounts-time-use-and-well-being/national-time-accounting-currency-life.