 It has been suggested that the better term would be "retail value of pirated [goods]", and that equating such a concept with financial loss is fallacious.Treating each pirated copy as a lost sale, and using an estimate for the number of pirated copies in existence, multiplied by their retail value, as tangible loss of profits by the industry has been called disparagingly "copyright math" (a term coined by writer Robert Reid) that leads to overestimation of the content industry losses.In academic literature there is no consensus that the concept of piracy is clearly correlated with reduction of revenue of sales of the pirated product, and estimates of lost sales have been similarly criticized, with a 2010 U.S. government report noting that many commonly cited figures cannot be substantiated.