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" ... Alternatively, the value of the uncaptured digital activity can be inferred from the opportunity cost (see Becker 1965) of the time spent online using free digital products (Goolsbee and Klenow 2006, Brynjolfsson and Oh 2012) or adjusting the telecommunication services output to account for the rapid growth in internet traffic (Mandel 2012). Both approaches suggest that accounting for this activity could add between one-third and two-thirds of a percentage point to the average annual growth rate of the UK economy over the past decade. ... "