According to the 2nd edition of a study by the United States Public Interest Research Group (US PIRG) published in February 2005: ""Textbook prices are increasing at more than four times the inflation rate for all finished goods, according to the Bureau of Labor Statistics Producer Price Index. The wholesale prices charged by textbook publishers have jumped 62 percent since 1994, while prices charged for all finished goods increased only 14 percent. Similarly, the prices charged by publishers for general books increased just 19 percent during the same time period.""