Abstract
This paper provides an integrative analysis of the drivers of vertical scope, using analytical and computational methods. I propose a model with two vertical segments (upstream and downstream), with firm populations that have heterogeneous capabilities, and an intermediate market subject to transaction costs, where firms can choose whether to be integrated or vertically specialized. By varying the level of transaction costs and changing the structure of the correlation between upstreamdownstream capabilities in the industry, as well as economies of scale; learning curves; and the way in which profitability leads to capability improvement in the upstream and downstream segments, I generate numerical results to explain how vertical integration evolves over time. The results suggest that (a) without capability differences, even if transaction costs are nil, firms remain integrated; (b) differences in economies of scale in the two segments may create or dampen specialization, depending on the underlying capability heterogeneity structure; (c) transaction costs catalyze the underlying capability differences to drive scope; (d) dynamic factors, such as learning curves; returns to investment in capabilities; or limits to expansion exacerbate small, random capability differences and as such promote specialization; and finally, these dynamic factors can just by themselves lead to
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