The international trade problems of the 1980s stimulated an expansion of scholarship on trade policies by economists and political scientists. At least four distinct theoretical perspectives weave their way through recent literature that concentrates on the United States—emphasizing market conditions, policy beliefs and values, national political institutions, and global structures, respectively. New studies in each of these traditions advance beyond the work of their predecessors, but none of the perspectives has yet proved adequate as a single unifying vehicle. Nevertheless, we can also see clear movement toward a synthesis, with single works blending insights from several traditions. Thus, the books under review do not all fall neatly into the familiar exclusive categories of “economics” or “political science.” The emerging synthesis needs strengthening in several ways, including the development of “conditioning hypotheses” that will reduce remaining apparent confusions.