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Abstract:
This paper uses a dynamic dominant-firm model with an endogenous merger process to examine the effects of trade liberalization on industry structure. Domestic and cross-border mergers and demergers are allowed for. When firms are myopic and the dominant firm has a sufficiently high pre-merger capital share in any one country, trade liberalization causes the industry to become significantly more concentrated. When firms are forward-looking, this anti-competitive effect of trade liberalization is mitigated. Tariff reduction from a prohibitive to a non-prohibitive level aligns merger patterns across countries and initiates merger (or demerger) waves simultaneously across countries, provided all firms are equally forward-looking. When the dominant firm is more forward-looking than the fringe, however, this result may be reversed. These results, thus, highlight the importance of taking into consideration existing industry structure and firms' discount rates whilst formulating competition policy in the face of trade liberalization.

endogenous market structure, horizontal mergers, trade liberalization

Abstract:
In a two-country model where firms behave à la Cournot, we show that marginal and non-marginal trade liberalization have different effects on the social desirability of horizontal mergers. Marginal tariff reductions increase (decrease) the desirability of merger at sufficiently low (high) tariff levels. In the neighborhood of free trade, for sufficiently low cost savings from merger, trade liberalization increases the desirability of merger whilst decreasing the profitability, implying that mergers should be actively encouraged by competition authorities. Furthermore, we identify ranges of tariff levels for which, if trade liberalization increases (decreases) the desirability of merger, it necessarily increases (decreases) its profitability.

Horizontal merger, trade liberalization, antitrust policy

Abstract:
In a bilateral trade framework, we examine the impact of tariff reduction on the optimal pollution tax and social welfare when pollution is transboundary. Strategic considerations lead countries to distort their pollution tax in the non-cooperative equilibrium. Trade liberalization changes the distortion, and consequently the pollution tax and welfare, in ways that depend on the extent to which pollution is transboundary. We find that when the pollution damage parameter is sufficiently small (large), bilateral tariff reduction always decreases (increases) the pollution tax, irrespective of the value of the transboundary pollution parameter. However, when the pollution damage parameter takes intermediate values, bilateral tariff reduction decreases the pollution tax if and only if the transboundary pollution parameter is sufficiently large (or even sufficiently small, in certain cases). Moreover, with pollution being transboundary, the impact of trade liberalization on welfare is non-monotonic and concave. The greater the extent to which pollution crosses borders, the more likely is trade liberalization to reduce welfare.

Transboundary pollution, Strategic trade, Bilateral tariff reduction, Pollution tax

Abstract:
We show that an environmental regulation such as a tax on pollution can act as a collusive device and induce stable cartelization in an oligopolistic polluting industry. We consider a dynamic game where pollution is allowed to accumulate into a stock over time and a cartel that includes all the firms in the industry. We show that a tax on pollution emissions can make it unprofitable for any firm to leave the cartel. Moreover the cartel formation can diminish the welfare gain from environmental regulation. We provide an example where social welfare under environmental regulation and collusion of firms is below social welfare under a laisser-faire policy.

pollution tax, oligopoly, cartel formation, coalition formation, differential game

Abstract:
We show that in a non-cooperative transboundary pollution game, a cleaner technology (i.e., a decrease in the emission to output ratio) induces each country to increase its emissions and ultimately can yield a higher level of pollution and reduce social welfare.

transboundary pollution, technological innovation, differential game

Abstract:
We analyze the effects of bilateral tariff reductions on the profitability of cost-reducing horizontal mergers. Given Cournot competition in a two-country world, for any positive tariff below a certain threshold, marginal trade liberalization is shown to encourage only those domestic mergers with sufficiently large cost-savings and to discourage the rest. For tariffs close to, but smaller than, the prohibitive tariff, however, marginal trade liberalization necessarily encourages all domestic mergers. Moreover, we show that for a given level of cost-savings, the impact of marginal trade liberalization may not reliably predict that of nonmarginal liberalization.

Although at high tariffs, domestic mergers are shown to be unambiguously more profitable than cross-border mergers, near free trade, mergers which yield the most cost-savings become the most profitable. Thus, when comparing domestic and cross-border mergers, trade liberalization encourages the type which yields the most cost-savings.