Abstract

Critics of international trade agreements often cast them as threats to human health, and they can point to some sobering warnings from world history. Infectious diseases have swept across political boundaries, carried by traders, colonists, and other agents of globalization. Transnational epidemics have laid economies low, undermining political stability. The spread of viruses and bacteria to peoples previously unexposed and therefore lacking immunity has decimated populations and changed the political course of continents. Trade, exploration, and warfare have repeatedly produced encounters between peoples at different levels of agricultural and technological development. Often, the results have been devastating for the disadvantaged group — economic marginalization, loss of sovereignty and culture, and collapse of public health. Yet the rise of civilization — plant and animal domestication, division of labor, technology, and resulting prosperity — was powered in large part by movement of products and knowledge along routes of trade and migration.