Referential USD based on CPI-U (2013e) PerezgonzalezJ 2014 <p>Referential USD provides the inflator/deflator multiplier for standardizing US dollars (within the philosophy of referential currencies).It is based on the average value of the United States consumer price index for all urban consumers - US CPI-U Average (United States Bureau of Labor Statistics, 2013). (Also retrievable from WikiofScience.)</p>