See Gordon (2016), or Brynjolfsson, E., & McAfee, A. (2014). 23 Particular internet-based services (e.g. Google searches or Wikipedia) are largely not reflected in GDP  measurements, as there is often no price attached to their use. See Box 1 in Adler, et al. (2017) for further information.
24 The real exchange rate is the nominal exchange rate, measured on a trade-weighted basis, adjusted for the  relative prices between New Zealand and our trading partners. This captures the fact that New Zealand faces many exchange rates, and a weighted measure of individual bilateral exchange rates is necessary to summarise the country’s exchange rate position.