We study the pricing policy of a monopolist selling a durable good with the features of a textbook. We assume buyers differ in their valuation of the good and propensity to resell, and identify the possibility of a positive relationship between the quantity of used goods and the price of a new good, and also a higher price for new goods in the last period before a new edition is introduced. Our empirical analysis supports this model: textbook prices increase as the share of used textbooks increases and the end of the current edition approaches. (JEL D420, L120)