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Abstract The current paper addresses the relationship between trade and endogenous pollution levels, with a focus different from the previous literature. The mechanism linking pollution and trade here is that trade policy provides the home government with a credible threat that helps motivate domestic firms to adopt cleaner technologies. This credible threat comes from the fact that the government has a greater incentive to protect a clean industry than to protect a very polluting one. In that sense, the existence of trade helps reduce domestic pollution compared to what would prevail in a situation of autarky. On the other hand, a commitment to free trade would be counterproductive: it removes the government's ability to credibly threaten lower levels of protection. In fact we show that any trade liberalization hurts the welfare of the home country. In terms of world welfare, moderate trade liberalization is helpful, but only as long as it does not affect the technology choices of the firms. Because committing to lower 'bounded' tariffs limits a government's ability to enforce strict environmental standards, a country that has agreed to tighter tariff limits under the World Trade Organization would, other things equal, be a more likely "pollution haven" than a country with weaker WTO commitments.

Abstract
We study a two-country model where two firms, one domestic and the other foreign, must decide when to introduce their new product into a market. The home government may apply an import tariff, an administrative delay, or both to the product of the foreign firm. An administrative delay imposes a waiting period between the time when the quality of the foreign product is determined and the time when the product can actually be sold. Our main interest is the differential effect of the tariff and the administrative delay on the timing of new product introductions and the resulting change in home, foreign and world welfare. We show that administrative delays are less efficient instruments for maximizing home welfare than tariffs. With a tariff, the home government can affect the timing of entry to ensure that the domestic firm moves first at the socially optimal date. Although an optimally chosen delay can achieve the same pattern of introduction, it does not yield any tariff revenues. As a result, if the tariff may be set optimally, administrative delays are not used in a discriminatory manner. If trade liberalization constrains the import tariff to be below its domestically optimal level, discriminatory administrative delays may become part of the optimal policy of the home country. As the optimal delay policy leads to lower levels of world welfare than the optimal tariff, trade liberalization can be welfare decreasing.