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FAF forecasts are a reasonable extrapolation of current trends, but do not reflect major shifts in the national economy, future capacity limitations, or changes in transportation costs and technology. An extensive system of economic models is used to convert national consumption patterns and foreign trade into purchases among industries and then into volumes of commodities reflected in those purchases. To evaluate how freight movement might be affected by changes in costs or other aspects of or to the transportation system, the FAF3 benchmark forecast would need to be supplemented by other models