We study how overlapping ownership affects the timing and size of capacity investments in duopoly. In addition to standard accommodation and delay strategies, internalization allows a leader to block follower entry. Follower timing and capacity reactions are less aggressive, making outcomes less competitive ex-post. Positional competition is more intense, and entry occurs earlier in equilibrium. Internalization raises a leader's incentive to delay follower entry rather than accommodate, and we show with an example that this strategic shift can benefit consumers.
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