A new study says textbook publishers have hiked the prices of their books at a rate much higher than inflation. “Textbook prices have increased at four times the average rate of inflation in their category, finished goods, over the past 10 years, according to figures from the Producer Price Index maintained by the Bureau of Labor Statistics. The wholesale price of textbooks increased 62 percent over that decade while the average price for all finished goods increased by just 14 percent. Prices for general books increased 19 percent in the same period.”