Noriaki Matsushima

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BACKGROUND Although there are many reports of high rates of hyperactivity and attention deficits in children with Pervasive Developmental Disorders (PDD), controversy remains about the applicability of the diagnosis of Attention-Deficit/Hyperactivity Disorder (ADHD) to PDD children. The present study elucidates the similarities and differences of ADHD(More)
We extend the well-known spatial competition model (d'Aspremont et al., 1979) to a continuous time model in which two firms compete in each instance. Our focus is on the entry timing decisions of firms and their optimal locations. We demonstrate that the leader has an incentive to locate closer to the centre to delay the follower's entry, leading to a(More)
We provide a simple model to investigate decisions about vertical separation. The key feature of this model is that more than one input is required for the final product of the downstream monopolist. We show that as the bargaining powers of independent complementary input suppliers grow larger, the downstream monopolist tends to separate from its input(More)
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