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To my dearest mum This thesis comprises three essays on industrial organization and multi-market contact. The first chapter models leading firms in innovation markets deciding first whether to share knowledge, and then playing a market entry game. When firms are sufficiently patient, we show that the feasibility of intellectual property disclosure via licensing to outsiders or fringe firms provides a useful additional threat to entry by the punishing firm in the entry game. The opposite is true when firms are impatient; the availability of intellectual property disclosure makes coordination harder. In addition, we show that if the probability that the leading firms will be able to innovate without knowledge sharing is sufficiently high and firms are sufficiently patient, then it is also possible for the firms to enforce a knowledge sharing agreement before innovation has taken place. The second chapter examines the incentives for predatory pricing within multi-markets. It considers an incumbent who is an uncontested monopolist in one market