Atlas method).7 Prices are expressed as a percentage of GNI p.c. The methodological details of the ITU price baskets can be found in Annex 1. International benchmarks The affordability of ICT services has traditionally been measured as a ratio of two elements: the price of the service and the economic welfare of the customer. Because the underlying costs of providing ICT services tend to decrease with time (e.g. newer mobile networks are more cost-efficient for data services), there is a rational expectation that ICT prices will go down.