1. National Waterways Conference, Inc. The Impact of Waterway User Charges–An Industry by Industry Assessment. Washington, 1968.
2. Harbeson Robert W. “The Regulation of Interagency Rate Competition Under the Transportation Act of 1958.” ICC Practitioners Journal. December 1962, pp. 287–308.
3. The estimate of four cents per bushel on corn and soybean prices is taken from Congressional Budget Office.
4. The asumption that the full cost of the user charge would be shifted to broiler producers is extreme. Most likely it would be allocated between the factors of production in barge transport, feed growers, and broiler producers in proportion to the relevant demand and supply elasticities.