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Experience in one product market can potentially improve firm performance in a related product market in the future. Thus, entry into a market is determined not just by profits in that market but also by its future impact on profitability in other markets. We formulate and estimate a dynamic model of entry decisions of firms in the presence of such spillovers using data on the generic drug industry. Spillovers imply that a firm's unobserved "ability" to profit in a product market not onlydoi:10.2139/ssrn.1674027 fatcat:mxy3nklmgjbyzpvg42ejizoq44