"The United States is in the process of considering a number of trade agreements. In addition, the 111th Congress may address the issue of trade promotion authority (TPA), which expired on July 1, 2007. These agreements range from bilateral trade agreements with countries that account for meager shares of U.S. trade to multilateral negotiations that could affect large numbers of U.S. workers and businesses. […] This report examines the major features of economic models being used to estimate the effects of trade agreements. It assesses the strengths and weaknesses of the models as an aid in helping Congress evaluate the economic impact of trade agreements on the U.S. economy. In addition, this report identifies and assesses some of the assumptions used in the economic models and how these assumptions affect the data generated by the models. Finally, this report evaluates the implications for Congress of various options it may consider as it assesses trade agreements."
CRS Report for Congress, RL31932