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Abstract: U sed goods markets are currently important transaction channels for durable products. For some durable products, such markets first appeared when retailers started buying back used products from "old" customers and selling them to new ones for a profit (retail used goods market). The growth of electronic peer-to-peer (P2P) markets opened up a second, frictionless used goods channel where new customers can buy used products directly from old customers (P2P used goods market). Both these markets compete with the original primary market where retailers sell unused products procured from the manufacturer. This paper focuses on understanding the role that the sequential emergence of the above two used goods markets plays in shaping the product upgrade strategy of the manufacturer and the pricing strategy of the primary market retailer in the context of a decentralized, dyadic channel dealing with a renewable set of consumers. Our analysis establishes that frequent product upgrades and rising retail prices in durable product sectors of our interest are due to the emergence of the P2P used goods market and how the market interacts with the retail used goods source in altering the relative powers of the channel partners. Moreover, contrary to popular belief, we show that the initial introduction of the retail used goods channel actually discourages introduction of new versions and restrains the rise in retail prices. We also comment on how the two used goods markets affect the profits of the channel partners. We then provide empirical support for our theoretical result regarding product upgrades using data from the college textbook industry, a durable product that fits our model setup.

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