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We analyze the effect of industrial espionage on entry deterrence. We consider a monopoly incumbent who may expand capacity to deter entry, and a potential entrant who owns an Intelligence System. The Intelligence System (IS) generates a noisy signal based on the incumbent's actions. The potential entrant uses this signal to decide whether or not to enter the market. The incumbent may signal-jam to manipulate the likelihood of the noisy signals and hence affect the entrant's decisions. If the precision of the IS is commonly known, the incumbent benefits from his rival's espionage. Actually, he benefits more the higher is the precision of the IS while the spying entrant is worse off with art IS of relatively high quality. When the IS quality is private information of the entrant, the incumbent is better off with an IS of high expected precision while the entrant benefits from one of high quality. In this case espionage makes the market more competitive. (C) 2013 Elsevier Inc. All rights reserved.