This Paper examines four models that might be used to account for variations in the number of producers who operate in a particular market over the lifetime of that market. Two of these are standard economics textbook models, one is a non-standard model and one is a textbook model derived from...

The goal of this essay is to bring the work of organizational ecologists on population dynamics to the attention of economists. Following a relatively brief exposition of the basic structure of the arguments made by organizational ecologists, we explore a number of areas where...

We analyse the interaction of asymmetric industries in international vertically related markets. Each downstream firm bargains efficiently with its domestic supplier in a first stage and with the foreign supplier in a second stage. The asymmetry in upstream costs leads to inter-industry trade....

In a repeated game setting of a vertically related industry, we study the collusive effects of vertical mergers. We show that any vertical merger facilitates upstream collusion, no matter how large (in terms of capacity or size of product portfolio) the integrated downstream buyer. But a...

We describe a pair of subadditivity tests that can be used to evaluate the technological feasibility of separating a vertically integrated network monopoly into a common infrastructure component and competing operating components. We implement the tests with a Generalized McFadden cost function...

What determines how integrated a firm is? We emphasize the benefits of "control" when there are difficulties in writing complete contracts. We define the firm as being composed of its assets. We present a theory of costly contracts which emphasizes that contractual rights can be of two types:...

This paper analyses the impact of competition among downstream firms on an upstream firm's payoff and on its incentive to vertically integrate when firms on both segments negotiate optimal contracts. We argue that tougher competition decreases the downstream industry profit, but improves the...

We investigate the robustness of the new foreclosure doctrine and its associated welfare implications to the introduction of incomplete information. In particular, we let the upstream firm’s marginal cost be private information, unknown to the downstream firms. The previous literature has...

In telecommunications some operators have deployed their own networks whereas some others have not. The latter firms must purchase wholesale products from the former to be able to compete on the final market. We show that, even when network operators compete in prices and offer perfectly...

Transactions take place in the firm rather than in the market because the firm offers agents who make specific investments power. Past literature emphasizes the allocation of ownership as the primary mechanism by which the firm does this. Within the contractibility assumptions of this...