A large body of theoretical work has explored the channels through which vertical contracts can induce efficiency improvements. However, it is also important to study vertical contracts empirically in order to gain insight into the relative size of different types of efficiency gains. In this paper, I empirically analyse a contractual innovation in the vertically separated video rental industry. Prior to 1998, video stores obtained inventory from movie distributors using simple linear-pricing contracts. In 1998, revenue-sharing contracts were widely adopted. I investigate the effect of the introduction of revenue-sharing contracts on firms' profits and consumer welfare. I analyse a new panel data set of home video retailers that includes information on individual retailers' contract and inventory choices, as well as rentals and contract terms for 246 movie titles and 6137 retailers in the U.S. during each week of 1998 and 1999 and the first half of 2000. A structural econometric model of firms' behaviour is developed that describes the nature of firms' contract choices. Estimates from this model indicate that both upstream and downstream profits increase by 10% under the revenue-sharing contract for popular titles. For less popular titles, the effects can be even larger. I also estimate that consumers benefit when revenue-sharing contracts are adopted. Copyright 2008 The Review of Economic Studies Limited.

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Incomplete product availability is an important feature of many markets; ignoring changes in availability may bias demand estimates. We study a new dataset from a wireless inventory system installed on 54 vending machines to track product availability every four hours. The data allow us to account for product availability when estimating demand, and provides a valuable source of variation for identifying substitution patterns. We develop a procedure that allows for changes in product availability even when availability is only observed periodically. We find significant differences in demand estimates, with the corrected model predicting significantly larger impacts of stock-outs on profitability. * We thank