In general, a reduction in trade barriers will affect the environment by expanding the scale of economic activity, by altering the composition of economic activity and by initiating a change in the techniques of production. We present empirical evidence to assess the relative magnitudes of these three effects as they apply to further trade liberalization in Mexico. We first use comparable measures of three air pollutants in a cross-section of urban areas located in 42 countries to study the relationship between air quality and economic growth. We find for two pollutants (sulphur dioxide and 'smoke') that concentrations increase with per capita GDP at low levels of national income, but decrease with GDP growth at higher levels of income. We then study the determinants of the industry pattern of US imports from Mexico and of value added by Mexico's maquiladora sector. We investigate whether the size of pollution abatement costs in US industry influences the pattern of international trade and investment. Finally, we use the results from a computable general equilibrium model to study the likely compositional effect of a North American Free Trade Agreement (NAFTA) on pollution in Mexico.

The proposed North American Free Trade Agreement (NAFTA) represents a historic change in relations among Canada, Mexico, and the United States. The effect of the agreement on the three economies has generated controversy and some degree of alarm within each country. In this book, noted trade and development experts review the available literature on the effects of NAFTA on the three member countries and the world trading system. They evaluate how NAFTA will affect areas such as economic growth, employment, income distribution, industry, and agriculture in Canada, Mexico, and the United States; and consider the significance the trade agreement holds for the rest of the world. Drusill K. Brown begins the discussion by providing an overview and comparison of the general results from recent studies. Raúl Hinojosa-Ojeda and Sherman Robinson explore in greater detail the potential effects of NAFTA on wages and employment in Mexico and the United States. Sidney Wintrab reviews industry-specific effects of NAFTA, in particular, the environment, the social agenda, and human rights and democracy. Finally, Carlos Alberto Primo Braga considers the implications of NAFTA on the rest of the world. Following each of these chapters, international scholars assess the alternatives and provide recommendations for future research.