I use data on the hospital networks offered by managed care health insurers to estimate the expected division of profits between insurers and providers. I include a simple profit-maximization framework and an additional effect: hospitals that can secure demand without contracting with all insurers (e.g., those most attractive to consumers and those that are capacity constrained) may demand high prices that some insurers refuse to pay. Hospital mergers may also affect price bargaining. I estimate that all three types of hospitals capture higher markups than other providers. These results provide information on the hospital investment incentives generated by bargaining.

Bundling is at the forefront of many policy debates as new technologies allow firms to implement more complex bundling arrangements. Realistic analyses of bundling—particularly between suppliers and retailers—require detailed data on both supply arrangements and consumer demand. We analyze firms' use of bundling as a vertical restraint (known as full-line forcing) using extensive supply and demand data from the video rental industry. Our model captures key details of the market that determine firms' contractual choices, and sheds light on the implications of these decisions. The empirical approach provides a model for how to analyze bundling when detailed data are available. (JEL D86, L14, L81, L82)